cmd/compile: disable append of make test on noopt builder

Updates #53888

Change-Id: I34ef2c5bd23816e1991cfec2bef4cae72676b523
Reviewed-on: https://go-review.googlesource.com/c/go/+/422037
Reviewed-by: Than McIntosh <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Run-TryBot: Cuong Manh Le <[email protected]>
Auto-Submit: Cuong Manh Le <[email protected]>

Author: cuonglm

src/cmd/compile/internal/test/issue53888_test.go

@@ -2,15 +2,21 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !race
+//go:build !race && !goexperiment.unified
 
 package test
 
 import (
+	"internal/testenv"
+	"strings"
 	"testing"
 )
 
+// TODO(cuonglm,mdempsky): figure out why Unifed IR failed?
 func TestAppendOfMake(t *testing.T) {
+	if strings.HasSuffix(testenv.Builder(), "-noopt") {
+		t.Skip("append of make optimization is disabled on noopt builder")
+	}
 	for n := 32; n < 33; n++ { // avoid stack allocation of make()
 		b := make([]byte, n)
 		f := func() {