Refine the loop rotation's API
Summary:
The following changes addresses the following two issues.
1) The existing loop rotation pass contains both loop latch simplification and loop rotation. So one flag RotationOnly is added to be passed to the loop rotation pass.
2) The threshold value is initialized with MAX_UINT since the loop rotation utility should not have threshold limit.
Reviewers: dmgreen, efriedma
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D45582
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330362
91177308-0d34-0410-b5e6-
96231b3b80d8
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