Summary:
This patch adds a macro fusion using CodeGen/MacroFusion.cpp to pair AES
instructions back to back and adds FeatureFuseAES to enable the feature.
Reviewers: evandro, javed.absar, rengolin, t.p.northover
Reviewed By: javed.absar
Subscribers: aemerson, mgorny, kristof.beyls, llvm-commits
Differential Revision: https://reviews.llvm.org/D34142
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305988 91177308-0d34-0410-b5e6-96231b3b80d8
