runtime: fix gccheckmark mode and enable by default
It was testing the mark bits on what roots pointed at, but not the remainder of the live heap, because in CL 2991 I accidentally inverted this check during refactoring. The next CL will turn it back off by default again, but I want one run on the builders with the full checkmark checks. Change-Id: Ic166458cea25c0a56e5387fc527cb166ff2e5ada Reviewed-on: https://go-review.googlesource.com/9824 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by:Rick Hudson <rlh@golang.org> Reviewed-by:
Austin Clements <austin@google.com>
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