test: enable inlining tests for functions with local type

Updates #57410

Change-Id: Ibe1f5523a4635d2b844b9a5db94514e07eb0bc0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463998
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
diff --git a/test/escape4.go b/test/escape4.go
index e381248..710eb75 100644
--- a/test/escape4.go
+++ b/test/escape4.go
@@ -38,11 +38,7 @@
 func f3() { panic(1) } // ERROR "can inline f3" "1 escapes to heap"
 func f4() { recover() }
 
-// TODO(cuonglm): remove f5, f6 //go:noinline and update the error message
-//                once GOEXPERIMENT=nounified is gone.
-
-//go:noinline
-func f5() *byte {
+func f5() *byte { // ERROR "can inline f5"
 	type T struct {
 		x [1]byte
 	}
@@ -50,8 +46,7 @@
 	return &t.x[0]
 }
 
-//go:noinline
-func f6() *byte {
+func f6() *byte { // ERROR "can inline f6"
 	type T struct {
 		x struct {
 			y byte