[clang] [clang][Modules] Complete the implementation of P2615: Meaningful exports (PR #194201)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cppm,cpp,h -- clang/include/clang/Parse/Parser.h clang/lib/Parse/ParseDeclCXX.cpp clang/test/Modules/explicit-specializations.cppm clang/test/Modules/merge-var-template-spec-cxx-modules.cppm clang/test/Modules/pr59780.cppm clang/test/Modules/pr60890.cppm clang/test/Modules/pr97313.cppm clang/test/Modules/template-function-specialization.cpp clang/test/SemaCXX/P2615.cpp clang/unittests/Serialization/LoadSpecLazilyTest.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
index ded616d78..e4d91451d 100644
--- a/clang/include/clang/Parse/Parser.h
+++ b/clang/include/clang/Parse/Parser.h
@@ -3217,8 +3217,9 @@ private:
   ///
   Decl *ParseExportDeclaration();
 
-  /// Ensure the declaration in an unbraced linkage-specification or export-declaration
-  /// is not an explicit-instantiation, explicit-specialization, or export-declaration:
+  /// Ensure the declaration in an unbraced linkage-specification or
+  /// export-declaration is not an explicit-instantiation,
+  /// explicit-specialization, or export-declaration:
   ///
   /// \verbatim
   ///       export-declaration: [C++: module.interface]

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https://github.com/llvm/llvm-project/pull/194201