[X86] Merge XADD8rr regular expression with XADD16rr/XADD32rr/XADD64rr in a couple scheduler models.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327821 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed