[dev.link] cmd/link: finish phase CPU profile before running GC
Currently, phase profiling runs GC at the end of a phase before
stopping the CPU profile. Rearrange things so we stop the CPU profile
right when we collect the end time-stamp and before dealing with GCs
and heap profiles.
Change-Id: I9a84b9b17c7db7f8cacf591147de15464298b6af
Reviewed-on: https://go-review.googlesource.com/c/go/+/224620
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>