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3a3b84b180
This removes the `ClassScopeFunctionSpecializationDecl` `Decl` node, and instead uses `DependentFunctionTemplateSpecializationInfo` to handle such declarations. `DependentFunctionTemplateSpecializationInfo` is also changed to store a `const ASTTemplateArgumentListInfo*` to be more in line with `FunctionTemplateSpecializationInfo`. This also changes `FunctionDecl::isFunctionTemplateSpecialization` to return `true` for dependent specializations, and `FunctionDecl::getTemplateSpecializationKind`/`FunctionDecl::getTemplateSpecializationKindForInstantiation` to return `TSK_ExplicitSpecialization` for non-friend dependent specializations (the same behavior as dependent class scope `ClassTemplateSepcializationDecl` & `VarTemplateSepcializationDecl`).