internal/fuzz,cmd/compile: don't add race instrumentation to counters
Don't add race detector instrumentation to the fuzzing counters,
allowing usage of -race without immediately triggering the
detector. Also fixes a minor race in contextReader.Read.
Fixes #48307
Change-Id: Idb2cfeaa4283f8a74473b4bac6cd68eed577e943
Reviewed-on: https://go-review.googlesource.com/c/go/+/351453
Trust: Roland Shoemaker <roland@golang.org>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Katie Hockman <katie@golang.org>