[X86] Improved sched model for X86 CMPXCHG* instructions.
Differential Revision: https://reviews.llvm.org/D50070 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341024 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed