[clang] [compiler-rt] [ubsan] Display correct runtime messages for negative _BitInt (PR #96240)

[via cfe-commits]

earnol wrote:

> One of the tests is failing:
> 
> ```
> $ LIT_FILTER=bit-int-pass ninja check-ubsan
> 
> compiler-rt/test/ubsan/TestCases/Integer/bit-int-pass.c:31:15: error: CHECK-NOT: excluded string found in input
> // CHECK-NOT: runtime error:
>               ^
> <stdin>:1:110: note: found here
> compiler-rt/test/ubsan/TestCases/Integer/bit-int-pass.c:11:10: runtime error: implicit conversion from type '_BitInt(37)' of value 60129542145 (64-bit, signed) to type 'uint32_t' (aka 'unsigned int') changed the value to 1 (32-bit, unsigned)
>                                                                                                              ^~~~~~~~~~~~~~
> ```

On what target you observe the failure?

https://github.com/llvm/llvm-project/pull/96240