strings: don't assert on Replace's allocs for ASAN
CL 657935 caused failures on the ASAN builder.
Under ASAN, do not assert on the number of allocations incurred by Replace.
Fixes #72973
Change-Id: I61536be6def6f2489d2a026c943c6e232865b723
GitHub-Last-Rev:
4aee3c2560c9a6fa6ba7c1950acc2172a7cfffe4
GitHub-Pull-Request: golang/go#72975
Reviewed-on: https://go-review.googlesource.com/c/go/+/659696
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Auto-Submit: Jorropo <jorropo.pgm@gmail.com>