[compiler-rt] [Sanitizers][ABI] Remove too strong assert in asan_abi_shim (PR #81696)

[Thurston Dang via llvm-commits]

thurstond wrote:

Suggestion: relax the assertion to `sizeof(uptr) == 4 || sizeof(uptr) == 8` instead of removing it entirely

https://github.com/llvm/llvm-project/pull/81696