[X86] Adding more cases to horizontal [f]add/[f]sub for avx512.

Reviewers: jbhateja

Reviewed By: jbhateja

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D38344

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314385 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed