ykiko ec4c47d949

Add code completion for C++20 keywords. (#107982) ...

This commit adds code completion for C++20 keywords, fix
https://github.com/llvm/llvm-project/issues/107868.

1. complete `concept` in template context
    - [x] `template<typename T> conce^` -> `concept`
    - [ ] `conce^`

2. complete `requires` 
- [x] constraints in template context: `template<typename T> requi^` ->
`requires`
- [x] requires expression: `int x = requ^` -> `requires (parameters) {
requirements }`
- [x] nested requirement: `requires { requ^ }` -> `requires expression
;`

3. complete coroutine keywords
    - [x] `co_await^` in expression: `co_aw^` -> `co_await expression;`
- [x] `co_yield` in function body: `co_yi^` -> `co_yield expression;`
- [x] `co_return` in function body: `co_re^` -> `co_return expression;`

4. specifiers: `char8_t`, `consteval`, `constinit`

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..

Inputs

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accessibility-crash.cpp

[lit] Script to automate use of %(line-n). Use in CodeComplete tests.

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accessibility.cpp

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after-function-equals.cpp

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attr.cpp

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auto_type.c

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auto.cpp

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bracket-decl.c

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call.c

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call.cpp

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comments.cpp

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concepts.cpp

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constexpr.cpp

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crash-func-decl.cpp

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crash-func-init.cpp

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crash-if-directive.cpp

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crash-null-type.cpp

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crash-skipped-bodies-template-inst.cpp

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ctor-initializer.cpp

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ctor-signature.cpp

[Clang] [Sema] Diagnose unknown std::initializer_list layout in SemaInit (#95580)

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desig-init.cpp

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deuglify.cpp

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documentation.cpp

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documentation.m

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enable-if-attr-crash.cpp

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end-of-file.cpp

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end-of-ident-macro.cpp

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end-of-ident.cpp

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enum-preferred-type.cpp

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enum-switch-case-qualified.cpp

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enum-switch-case.c

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enum-switch-case.cpp

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function-overloads.cpp

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function-templates.cpp

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functions.cpp

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ignore-ns-level-decls.cpp

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included-files.cpp

clang/test/CodeCompletion: Simplify/fix some touch commands

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included-frameworks.m

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included-symlinks.cpp

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incomplete-member.cpp

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incomplete-ret-type.cpp

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incrememal-mode-completion-no-error.cpp

Reland "[clang-repl] support code completion at a REPL."

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incremental-top-level.cpp

Reland "[clang-repl] support code completion at a REPL."

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inside-macros.cpp

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invalid-initialized-class.cpp

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keywords-cxx20.cpp

Add code completion for C++20 keywords. (#107982)

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keywords.cpp

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lambdas.cpp

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macros-in-modules.c

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macros-in-modules.m

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macros.c

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member-access-qualifiers.cpp

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member-access.c

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member-access.cpp

[clang][CodeComplete] Recurse into the subexpression of deref operator in getApproximateType (#93404)

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namespace-alias.cpp

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namespace.cpp

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nested-name-specifier.cpp

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objc-expr.m

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objc-member-access.m

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objc-message.m

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objc-message.mm

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objc-protocol-member-access.m

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operator.cpp

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ordinary-name-cxx11.cpp

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ordinary-name.c

[clang][CodeCompletion] Allow debuggers to code-complete reserved identifiers (#84891)

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ordinary-name.cpp

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overrides.cpp

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paren_locs.cpp

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patterns.cpp

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pch-and-module.m

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PR9728.cpp

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pragma-macro-token-caching.c

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preamble.c

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preferred-type.cpp

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qualifiers-as-written.cpp

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self-inits.cpp

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signatures-crash.cpp

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skip-auto-funcs.cpp

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some_struct.h

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stdin.c

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tag.c

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tag.cpp

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template-signature.cpp

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templates.cpp

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this-quals.cpp

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truncation.c

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truncation.c.h

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uninstantiated_params.cpp

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using-enum.cpp

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using-namespace.cpp

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using.cpp

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variadic-template.cpp

[clang] check deduction consistency when partial ordering function templates (#100692)

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