[llvm] [WindowsDriver] Find Visual Studio through the Setup API on MinGW (PR #226794)

[A. Jiang via llvm-commits]

frederick-vs-ja wrote:

> cc @mstorsjo

LLVM uses the PR title description and as the squashed commit message by default, so it's better not to tag someone in the PR description. If `@[...]` goes into the squashed commit message and the commit is replicated somewhere, GitHub will attempt to send a mail to that account. I dropped this part from the PR message.

https://github.com/llvm/llvm-project/pull/226794