[clang] Sanitizer: Support -fwrapv with -fsanitize=signed-integer-overflow (PR #82432)

[Kees Cook via cfe-commits]

kees wrote:

This doesn't seem to do anything for me with the Linux kernel's -next branch (which supports -sio as `CONFIG_UBSAN_SIGNED_WRAP=y`). e.g. I see no behavioral difference with test_ubsan.ko nor the expected atomic overflows.

https://github.com/llvm/llvm-project/pull/82432