Chandler Carruth 1c28b57b8b [PM] Teach the LoopPassManager to automatically canonicalize loops by
runnig LCSSA over them prior to running the loop pipeline.

This also teaches the loop PM to verify that LCSSA form is preserved
throughout the pipeline's run across the loop nest.

Most of the test updates just leverage this new functionality. One has to be
relaxed with the new PM as IVUsers is less powerful when it sees LCSSA input.

Differential Revision: https://reviews.llvm.org/D28743

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292241 91177308-0d34-0410-b5e6-96231b3b80d8
2017-01-17 19:18:12 +00:00
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