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0885a28635
Patch replaces old isEquivalentOperation implementation, and changes type of comparison result from bool (equal or not) to {-1, 0, 1} (less, equal, greater). This patch belongs to patch series that improves MergeFunctions performance time from O(N*N) to O(N*log(N)). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208973 91177308-0d34-0410-b5e6-96231b3b80d8