[Webkit-unassigned] [Bug 150775] B3::LowerToAir should do copy propagation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150775

--- Comment #1 from Filip Pizlo <fpizlo at apple.com> ---
Interestingly though, we may not need to do anything special for SExt.  The FTL is already smart enough to use ZExt in all those cases where the input is non-negative.

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