[clang] [C11] Diagnose C11 keywords as being incompatible w/earlier standards (PR #82015)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff f55b79f59a77b4be586d649e9ced9f8667265011 6bce3bc879072a915c6c77b2a3d9d96d60d568ee -- clang/test/Sema/c11-keywords.c clang/include/clang/Parse/Parser.h clang/lib/Parse/ParseDecl.cpp clang/lib/Parse/ParseDeclCXX.cpp clang/lib/Parse/ParseExpr.cpp clang/lib/Parse/Parser.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
index abc06468fc..c5a18e4bd7 100644
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -2742,7 +2742,7 @@ bool Parser::parseMisplacedModuleImport() {
   return false;
 }
 
-void Parser::diagnoseUseOfC11Keyword(const Token& Tok) {
+void Parser::diagnoseUseOfC11Keyword(const Token &Tok) {
   // Warn that this is a C11 extension if in an older mode or if in C++.
   // Otherwise, warn that it is incompatible with standards before C11 if in
   // C11 or later.

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https://github.com/llvm/llvm-project/pull/82015