[clang] [BitInt] Expose a _BitInt literal suffix in C++ (PR #86586)

[Erich Keane via cfe-commits]

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@@ -974,6 +974,7 @@ NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
   bool isFixedPointConstant = isFixedPointLiteral();
   bool isFPConstant = isFloatingLiteral();
   bool HasSize = false;
+  bool PossibleBitInt = false;
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erichkeane wrote:

I'd  want this generalized for all 'starts with two `_` cases.

https://github.com/llvm/llvm-project/pull/86586