cmd/compile/internal/test: fix noopt builder

The function argument passed to hash function escaped to heap when
optimization is disabled, causing the builder failed.

To fix this, skip the test on noopt builder.

Updates #71943
Fixes #71965

Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-noopt
Change-Id: I3a9ece09bfa10bf5eb102a7da3ade65634565cb4
Reviewed-on: https://go-review.googlesource.com/c/go/+/652735
Reviewed-by: Dmitri Shuralyov <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Cuong Manh Le <[email protected]>

Author: cuonglm

src/cmd/compile/internal/test/issue71943_test.go

@@ -6,6 +6,7 @@ package test
 
 import (
 	"crypto/sha256"
+	"internal/testenv"
 	"runtime"
 	"testing"
 )
@@ -15,6 +16,7 @@ func Verify(token, salt string) [32]byte {
 }
 
 func TestIssue71943(t *testing.T) {
+	testenv.SkipIfOptimizationOff(t)
 	if n := testing.AllocsPerRun(10, func() {
 		runtime.KeepAlive(Verify("teststring", "test"))
 	}); n > 0 {