[clang] [compiler-rt] [ubsan] Display correct runtime messages for negative _BitInt (PR #93612)

[via cfe-commits]

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@@ -125,6 +138,26 @@ class TypeDescriptor {
     return 1 << (TypeInfo >> 1);
   }
 
+  const char *getBitIntBitCountPointer() const {
+    CHECK(isBitIntTy());
+    CHECK(isSignedBitIntTy());
+    // Scan Name for zero and return the next address
+    const char *p = getTypeName();
+    while (*p != '\0') {
+      p++;
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earnol wrote:

Agree.

https://github.com/llvm/llvm-project/pull/93612