[clang] Reapply "[Clang] Implement P3034R1 Module Declarations Shouldn’t be Macros" (PR #102135)

[Shafik Yaghmour via cfe-commits]

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@@ -4558,6 +4574,12 @@ bool Lexer::LexDependencyDirectiveToken(Token &Result) {
     Result.setRawIdentifierData(TokPtr);
     if (!isLexingRawMode()) {
       const IdentifierInfo *II = PP->LookUpIdentifierInfo(Result);
+      if (Result.isModuleContextualKeyword()) {
+        // Result.setFlagValue(Token::StartOfLine,
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shafik wrote:

dead code?

https://github.com/llvm/llvm-project/pull/102135