runtime: add GODEBUG=gccheckmark=0/1
Previously, gccheckmark could only be enabled or disabled by calling runtime.GCcheckmarkenable/GCcheckmarkdisable. This was a necessary hack because GODEBUG was broken. Now that GODEBUG works again, move control over gccheckmark to a GODEBUG variable and remove these runtime functions. Currently, gccheckmark is enabled by default (and will probably remain so for much of the 1.5 development cycle). Change-Id: I2bc6f30c21b795264edf7dbb6bd7354b050673ab Reviewed-on: https://go-review.googlesource.com/2603Reviewed-by:Rick Hudson <rlh@golang.org>
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