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c951003faf
When building the pairable-instruction dependency map, don't search past the last pairable instruction. For large blocks that have been divided into multiple instruction groups, searching past the last instruction in each group is very wasteful. This gives a 32% speedup on the csa.ll test case from PR15222 (when using 50 instructions in each group). No functionality change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174915 91177308-0d34-0410-b5e6-96231b3b80d8
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