runtime: update gctrace line for new garbage collector
GODEBUG=gctrace=1 turns on a per-GC cycle trace line. The current line is left over from the STW garbage collector and includes a lot of information that is no longer meaningful for the concurrent GC and doesn't include a lot of information that is important. Replace this line with a new line designed for the new garbage collector. This new line is focused more on helping the user understand the impact of the garbage collector on their program and less on telling us, the runtime developers, everything that's happening inside GC. It's designed to fit in 80 columns and intentionally omit some potentially useful things that were in the old line. We might want a "verbose" mode that adds information for us. We'll be able to further simplify the line once we eliminate the STW around enabling the write barrier. Then we'll have just one STW phase, one concurrent phase, and one more STW phase, so we'll be able to reduce the number of times from five to three. Change-Id: Icc30939fe4576fb4491b4eac811649395727aa2a Reviewed-on: https://go-review.googlesource.com/8208Reviewed-by:Russ Cox <rsc@golang.org>
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