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: 4aee3c2560
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>

src/strings/strings_test.go

@@ -7,6 +7,7 @@ package strings_test
 import (
 	"bytes"
 	"fmt"
+	"internal/asan"
 	"io"
 	"iter"
 	"math"
@@ -1473,10 +1474,12 @@ var ReplaceTests = []struct {
 
 func TestReplace(t *testing.T) {
 	for _, tt := range ReplaceTests {
+		if !asan.Enabled { // See issue #72973.
 			allocs := testing.AllocsPerRun(10, func() { Replace(tt.in, tt.old, tt.new, tt.n) })
 			if allocs > 1 {
 				t.Errorf("Replace(%q, %q, %q, %d) allocates %.2f objects", tt.in, tt.old, tt.new, tt.n, allocs)
 			}
+		}
 		if s := Replace(tt.in, tt.old, tt.new, tt.n); s != tt.out {
 			t.Errorf("Replace(%q, %q, %q, %d) = %q, want %q", tt.in, tt.old, tt.new, tt.n, s, tt.out)
 		}