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

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> > How i can see the full amount of breakage on different platforms proactively? I have created a PR: #104607 to address the big endian issue with the test as my // REQUIRES: x86-registered-target turned out not to be enough to exclude running test in the big endian platforms. If you insisting on reverting PR completely it is also fine, but it would be useful to see the full list of errors on different platforms so i would be able to address those.
> 
> Ah, if that's resolving the issues, then that's totally fine to fix forward rather than revert. Thank you!

Also it's totally fine to revert/reland multiple times, incrementally detecting and fixing breakages related to the patch.
Broken build bot will more likely hide other breakages, making it harder to restore bots into green state.


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