Francis Visoiu Mistrih aa5ec34e31 [LoopDeletion] Emit a remark when a dead loop is deleted ...

This emits a remark when LoopDeletion deletes a dead loop, using the
source location of the loop's header. There are currently two reasons
for removing the loop: invariant loop or loop that never executes.

Differential Revision: https://reviews.llvm.org/D83113

2020-07-03 15:20:23 -07:00

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