all: use slices.Equal to simplify code

Change-Id: Ib3be7cee6ca6dce899805aac176ca789eb2fd0f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/661738
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Sean Liao <sean@liao.dev>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

src/internal/syscall/windows/registry/registry_test.go

@@ -10,6 +10,7 @@ import (
 	"bytes"
 	"crypto/rand"
 	"os"
+	"slices"
 	"syscall"
 	"testing"
 	"unsafe"
@@ -100,21 +101,6 @@ func TestCreateOpenDeleteKey(t *testing.T) {
 	}
 }
 
-func equalStringSlice(a, b []string) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	if a == nil {
-		return true
-	}
-	for i := range a {
-		if a[i] != b[i] {
-			return false
-		}
-	}
-	return true
-}
-
 type ValueTest struct {
 	Type     uint32
 	Name     string
@@ -304,7 +290,7 @@ func testGetStringsValue(t *testing.T, k registry.Key, test ValueTest) {
 		t.Errorf("GetStringsValue(%s) failed: %v", test.Name, err)
 		return
 	}
-	if !equalStringSlice(got, test.Value.([]string)) {
+	if !slices.Equal(got, test.Value.([]string)) {
 		t.Errorf("want %s value %#v, got %#v", test.Name, test.Value, got)
 		return
 	}

src/runtime/pprof/pprof_test.go

@@ -2558,15 +2558,7 @@ func TestProfilerStackDepth(t *testing.T) {
 }
 
 func hasPrefix(stk []string, prefix []string) bool {
-	if len(prefix) > len(stk) {
+	return len(prefix) <= len(stk) && slices.Equal(stk[:len(prefix)], prefix)
-		return false
-	}
-	for i := range prefix {
-		if stk[i] != prefix[i] {
-			return false
-		}
-	}
-	return true
 }
 
 // ensure that stack records are valid map keys (comparable)