Ravi Kandhadai 935686460c [SIL Optimization] Create a new utility InstructionDeleter to delete instructions ...

and eliminate dead code. This is meant to be a replacement for the utility:
recursivelyDeleteTriviallyDeadInstructions. The new utility performs more aggresive
dead-code elimination for ownership SIL.

This patch also migrates most non-force-delete uses of
recursivelyDeleteTriviallyDeadInstructions to the new utility.
and migrates one force-delete use of recursivelyDeleteTriviallyDeadInstructions
(in IRGenPrepare) to use the new utility.

2019-12-18 13:17:17 -08:00

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