[clang] [HLSL] Support vector swizzles on scalars (PR #67700)

[via cfe-commits]

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@@ -1950,6 +1950,10 @@ bool Lexer::LexNumericConstant(Token &Result, const char 
*CurPtr) {
   while (isPreprocessingNumberBody(C)) {
     CurPtr = ConsumeChar(CurPtr, Size, Result);
     PrevCh = C;
+    if (LangOpts.HLSL && C == '.' && (*CurPtr == 'x' || *CurPtr == 'r')) {
+      CurPtr--;
----------------
cor3ntin wrote:

Indeed!

https://github.com/llvm/llvm-project/pull/67700
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