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Fix crash in ASTImporter related to import of unnamed structures and typedefs to these maybe with pointer. There was a series of problems exposed by https://reviews.llvm.org/D133468 (commit 69a6417406a1b0316a1fa6aeb63339d0e1d2abbd) in the ASTImporter breaking cross-translation unit analysis. This change fixes one of the problems exposed by that change for importing unnamed structures. The problem was discovered when running clang static analysis on open source projects using cross-translation unit analysis. Simple test command. Produces crash without change, passes all tests with change. ``` ninja ASTTests && ./tools/clang/unittests/AST/ASTTests --gtest_filter="*/*ImportAnonymousStruct/0" ``` Formatted crash stack: ``` ASTTests: <root>/clang/lib/AST/ASTContext.cpp:4787: clang::QualType clang::ASTContext::getTypedefType(const clang::TypedefNameDecl*, clang::QualType) const: Assertion `hasSameType(Decl->getUnderlyingType(), Underlying)' failed. ... #9 <addr> clang::ASTContext::getTypedefType(clang::TypedefNameDecl const*, clang::QualType) const <root>/clang/lib/AST/ASTContext.cpp:4789:26 <root>/clang/lib/AST/ASTImporter.cpp:1374:71 <root>/tools/clang/include/clang/AST/TypeNodes.inc:75:1 <root>/clang/lib/AST/ASTImporter.cpp:8663:8 ``` Reviewed By: donat.nagy Differential Revision: https://reviews.llvm.org/D145868
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