This adds a fallback in case that the Intel compiler is failed to be detected correctly.
As far as I know Intel on Windows is capable off handling gnu-style options, but I don't have a test system.
@vchuravy, please do things in the next time when you create a differential,
- Add *-commits to subscribers
- Create diff to let contain whole the file, with "diff -U999999"
I am still new to submitting patches to llvm so thanks for pointing that out to me.