[X86] AVX512: Improve readability of isCDisp8

No functional change.  As I was trying to understand this function, I found
that variables were reused with confusing names and the broadcast case was a
bit too implicit.  Hopefully, this is an improvement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212795 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed