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

wxwern wants to merge 3 commits intollvm:mainllvm/llvm-project:mainfrom

wxwern:fix-unknown-crash-desc-for-multi-byte-errwxwern/llvm-project:fix-unknown-crash-desc-for-multi-byte-errCopy head branch name to clipboard