[compiler-rt] [compiler-rt] [MSVC] Detect MSVC as a compiler-id for lit. (PR #108255)

[Martin Storsjö via llvm-commits]

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

LGTM

This seems to fit in line with the existing checks.

https://github.com/llvm/llvm-project/pull/108255