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Russ Cox authored
- Some sequencing issues with stopping the first gc_m round at the right place to set up correctly for the second round. - atomicxor8 is not idempotent; avoid xor. - Maintain BitsDead type bits correctly; see long comment added. - Enable checkmark phase by default for now. LGTM=rlh R=rlh CC=golang-codereviews https://golang.org/cl/171090043
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