Commit ff68e43c authored by Jingu Kang's avatar Jingu Kang
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[MachineLICM] Handle Subloops

It is a re-commit from reverted commit 3454cf67.

Following discussion on https://reviews.llvm.org/D154205, make MachineLICM pass
handle subloops with only visiting outermost loop's blocks once.

Differential Revision: https://reviews.llvm.org/D154205
parent 904b3f66
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