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Commit d850ca36 authored by Rafael Auler's avatar Rafael Auler Committed by Maksim Panchenko
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[BOLT] Add shrink wrapping pass 

Summary:
Add an implementation for shrink wrapping, a frame optimization
that moves callee-saved register spills from hot prologues to cold
successors.

(cherry picked from FBD4983706)
parent 4b485f41
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