test: merge arm-intrin into ms-intrin, fix invocation

This merges the two tests into one since there is no real reason to separate
them.  It also fixes the test invocation to specify -fms-compatibility without
which we would end up without an Intrin.h header.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212563 91177308-0d34-0410-b5e6-96231b3b80d8