[AVX-512] Add avx512vl command line to the fpext test and add -show-mc-encoding to show where we aren't using EVEX instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286058 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed