cmd/compile: add countRule rewrite rule helper

noteRule is useful when you're trying to debug
a particular rule, or get a general sense for
how often a rule fires overall.

It is less useful if you're trying to figure
out which functions might be useful to benchmark
to ascertain the impact of a newly added rule.

Enter countRule. You use it like noteRule,
except that you get per-function summaries.

Sample output:

 # runtime
(*mspan).sweep: idx1=1
evacuate_faststr: idx1=1
evacuate_fast32: idx1=1
evacuate: idx1=2
evacuate_fast64: idx1=1
sweepone: idx1=1
purgecachedstats: idx1=1
mProf_Free: idx1=1

This suggests that the map benchmarks
might be good to run for this added rule.

Change-Id: Id471c3231f1736165f2020f6979ff01c29677808
Reviewed-on: https://go-review.googlesource.com/c/go/+/167088


Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>