[compiler-rt] [asan] Fix `unknown-crash` being reported for multi-byte errors, and incorrect memory access addresses being reported (PR #144480)

[via llvm-commits]

wxwern wrote:

@vitalybuka I've made some updates, and the PR description has been updated with more details and findings. Please do let me know if they're alright, thanks!

https://github.com/llvm/llvm-project/pull/144480