runtime: add cumulative GC CPU % to gctrace line
This tracks both total CPU time used by GC and the total time available to all Ps since the beginning of the program and uses this to derive a cumulative CPU usage percent for the gctrace line. Change-Id: Ica85372b8dd45f7621909b325d5ac713a9b0d015 Reviewed-on: https://go-review.googlesource.com/8350Reviewed-by:Russ Cox <rsc@golang.org>
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