[PATCH] D147036: [GuardWidening] Use BFI to reject obviously unprofitable widening

[Anna Thomas via Phabricator via llvm-commits]

anna added a comment.

In D147036#4267706 <https://reviews.llvm.org/D147036#4267706>, @skatkov wrote:

> Looks pretty straightforward.  Please introduce an option and lgtm.

+1 on the option. It's nice to have profitability heuristics under an option so that we can stress test functionality.


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