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Carl Shapiro authored
With this change the compiler emits a bitmap for each function covering its stack frame arguments area. If an argument word is known to contain a pointer, a bit is set. The garbage collector reads this information when scanning the stack by frames and uses it to ignores locations known to not contain a pointer. R=golang-dev, bradfitz, daniel.morsing, dvyukov, khr, khr, iant, cshapiro CC=golang-dev https://golang.org/cl/9223046
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