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

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@@ -3292,22 +3307,39 @@ LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
 ///   { i16 TypeKind, i16 TypeInfo }
 /// \endcode
 ///
-/// followed by an array of i8 containing the type name. TypeKind is 0 for an
-/// integer, 1 for a floating point value, and -1 for anything else.
+/// followed by an array of i8 containing the type name with extra information
+/// for BitInt. TypeKind is 0 for an integer, 1 for a floating point value, 2
+/// for BitInt and -1 for anything else.
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earnol wrote:

I think it is important that those values are 16 bit integers. I'll replace with TK_BitInt(2).

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