[compiler-rt] [llvm] [msan] Add 32-bit platforms support (PR #109284)

[Vitaly Buka via llvm-commits]

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

LGTM
Can merge after the rest of comments is resolved.

Though, I didn't rely validate vararg  ABI for new platforms.

https://github.com/llvm/llvm-project/pull/109284