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Summary: Fixes a FIXME in MachineSinking. Instead of using the simple heuristics in isPostDominatedBy, use the real MachinePostDominatorTree. The old heuristics caused instructions to sink unnecessarily, and might create register pressure. Test Plan: Added a NVPTX codegen test to verify that our change is in effect. It also shows the unnecessary register pressure caused by over-sinking. Updated affected tests in AArch64 and X86. Reviewers: eliben, meheff, Jiangning Reviewed By: Jiangning Subscribers: jholewinski, aemerson, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D4814 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216862 91177308-0d34-0410-b5e6-96231b3b80d8
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