[compiler-rt] [compiler-rt][windows] Test fixups for MSVC. (PR #109887)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> > LGTM with comments
> > set of PRs could be nicer
> 
> By "set of PRs" do you mean splitting this into multiple PRs or posting the follow-ups immediately?

Both: Splitting, and landing, and followups in new PRs

And make sure to "re-request" review if you expect reviewer attention.

https://github.com/llvm/llvm-project/pull/109887