[clang] [compiler-rt] [llvm] [compiler-rt][UBSan] Add __ubsan_default_suppressions() hook (PR #194862)

[Vitaly Buka via cfe-commits]

https://github.com/vitalybuka approved this pull request.

Added some missing minor pieces.
Please double check if it's OK

https://github.com/llvm/llvm-project/pull/194862