tree ad67507a0a754041da8dcd6f4bf3ac7bb21d14a3
parent b42744825e3f2d1d2981eedbb67d6ac6419b8122
author Cherry Zhang <cherryyz@google.com> 1553547018 -0400
committer Ian Lance Taylor <iant@golang.org> 1556746581 +0000

compiler: recognize and optimize map range clear

Recognize

	for k := range m { delete(m, k) }

for map m, and rewrite it to runtime.mapclear, as the gc compiler
does.

Change-Id: I13ca2e4341f33932ef278823d34d5548bb1f9822
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/169397
Reviewed-by: Ian Lance Taylor <iant@golang.org>