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Max Kazantsev 054361e47d [LoopLoadElim] Filter away candidates that stop being AddRecs after loop versioning. PR47457
The test in PR47457 demonstrates a situation when candidate load's pointer's SCEV
is no loger a SCEVAddRec after loop versioning. The code there assumes that it is
always a SCEVAddRec and crashes otherwise.

This patch makes sure that we do not consider candidates for which this requirement
is broken after the versioning.

Differential Revision: https://reviews.llvm.org/D87355
Reviewed By: asbirlea
2020-09-10 13:30:31 +07:00
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