Alina Sbirlea 1d09174290 [LoopStrengthReduce] Reuse utility method to clean dead instructions. [NFCI] ...

Create a utility wrapper for the RecursivelyDeleteTriviallyDeadInstructions utility
method, which sets to nullptr the instructions that are not trivially
dead. Use the new method in LoopStrengthReduce.
Alternative: add a bool to the same method; this option adds a marginal
amount of overhead to the other callers, and the method needs to be
updated to return a bool status when it removes/doesn't remove
instructions.

2020-01-23 16:27:32 -08:00

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