tests: relax ms-intrinsics test

Relax the tests to allow for differences between release and debug builds.  This
should fix the buildbots.

Thanks to Benjamin Kramer and Eric Christo for their invaluable tip that this
was release build specific issue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211227 91177308-0d34-0410-b5e6-96231b3b80d8