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

[via cfe-commits]

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@@ -1117,6 +1118,26 @@ NumericLiteralParser::NumericLiteralParser(StringRef 
TokSpelling,
       if (isImaginary) break;   // Cannot be repeated.
       isImaginary = true;
       continue;  // Success.
+    case '_':
+      if (isFPConstant)
+        break; // Invalid for floats
+      if (HasSize)
+        break;
+      if (PossibleBitInt)
+        break; // Cannot be repeated.
+      if (LangOpts.CPlusPlus && s[1] == '_') {
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Sirraide wrote:

Ah, I see, makes sense.

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