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cmd/gc, runtime: optimize map[string] lookup from byte key
Brad has been asking for this for a while. I have resisted because I wanted to find a more general way to do this, one that would keep the performance of code introducing variables the same as the performance of code that did not. (See golang.org/issue/3512#c20). I have not found the more general way, and recent changes to remove ambiguously live temporaries have blown away the property I was trying to preserve, so that's no longer a reason not to make the change. Fixes #3512. LGTM=iant R=iant CC=bradfitz, golang-codereviews, khr, r https://golang.org/cl/83740044
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