Export TemplateArgumentMatcher so clients defining custom matchers don't need to use the internal namespace

[davidvancleve]

Summary

This change adds another export, using TemplateArgumentMatcher = internal::Matcher<TemplateArgument>;, to the collection of exports that put instantiations of the clang::ast_matchers::internal::Matcher into the clang::ast_matchers namespace. This makes it possible to define custom TemplateArgument matchers without reaching into the internal namespace.

[davidvancleve]

+klimek: I added you from glancing at CODE_OWNERS.txt; are you a good reviewer?

[klimek]

lg

[davidvancleve]

Hi klimek, any more action needed on my part to land this? This is my first LLVM change.

clang/include/clang/ASTMatchers/ASTMatchers.h

 /// @{
 using DeclarationMatcher = internal::Matcher<Decl>;
 using StatementMatcher = internal::Matcher<Stmt>;
 using TypeMatcher = internal::Matcher<QualType>;
 using TypeLocMatcher = internal::Matcher<TypeLoc>;
 using NestedNameSpecifierMatcher = internal::Matcher<NestedNameSpecifier>;
 using NestedNameSpecifierLocMatcher = internal::Matcher<NestedNameSpecifierLoc>;
 using CXXCtorInitializerMatcher = internal::Matcher<CXXCtorInitializer>;
+using TemplateArgumentMatcher = internal::Matcher<TemplateArgument>;
 using TemplateArgumentLocMatcher = internal::Matcher<TemplateArgumentLoc>;
 /// @}
 
 /// Matches any node.
 ///
 /// Useful when another matcher requires a child matcher, but there's no
 /// additional constraint. This will often be used with an explicit conversion
 /// to an \c internal::Matcher<> type such as \c TypeMatcher.