[X86] AVX512: Rename EVEX_CD8V to CD8_Form

This is to match the naming of CD8_EltSize, CD8_Scale, etc.

No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213280 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed