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[MachineSink] Compile time improvement for large testcases which has …
…many kill flags We did a experiment and observed dramatic decrease on compilation time which spent on clearing kill flags. Before: Number of BasicBlocks:33357 Number of Instructions:162067 Number of Cleared Kill Flags:32869 Time of handling kill flags(ms):1.607509e+05 After: Number of BasicBlocks:33357 Number of Instructions:162067 Number of Cleared Kill Flags:32869 Time of handling kill flags:3.987371e+03 Reviewed By: MatzeB Differential Revision: https://reviews.llvm.org/D111688
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