tree abf2c0753aa4d2dc3862ac465515071c647a6944
parent 86fdcbedbcb868f7f2e8274d2b50f0ea34043c47
author Austin Clements <austin@google.com> 1420830040 -0500
committer Austin Clements <austin@google.com> 1421080610 +0000

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/2603
Reviewed-by: Rick Hudson <rlh@golang.org>