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for the Cortex-A53 subtarget in the AArch64 backend. This patch lays the ground work to annotate each AArch64 instruction (no NEON yet) with a list of SchedReadWrite types. The patch also provides the Cortex-A53 processor resources, maps those the the default SchedReadWrites, and provides basic latency. NEON support will be added in a subsequent patch with proper forwarding logic. Verification was done by setting the pre-RA scheduler to linearize to better gauge the effect of the MIScheduler. Even without modeling the forward logic, the results show a modest improvement for Cortex-A53. Reviewers: apazos, mcrosier, atrick Patch by Dave Estes <cestes@codeaurora.org>! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203125 91177308-0d34-0410-b5e6-96231b3b80d8
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