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

[via cfe-commits]

================
@@ -1117,6 +1118,31 @@ 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 (DoubleUnderscore)
+        break; // Cannot be repeated.
----------------
Sirraide wrote:

An assertion would also make sense yeah.

> whoever wants to do the work

(For the record, I’m busy refactoring AST visitors so not me)

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