cmd/compile: remove adjustctx from inline test

After golang.org/cl/33895, function adjustctx can not be inlined,
cost 82 exceeds budget 80

Change-Id: Ie559ed80ea2c251add940a99f11b2983f6cbddbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/187977
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/inl_test.go

@@ -31,10 +31,6 @@ func TestIntendedInlining(t *testing.T) {
 	// might not actually be inlined anywhere.
 	want := map[string][]string{
 		"runtime": {
-			// TODO(mvdan): enable these once mid-stack
-			// inlining is available
-			// "adjustctxt",
-
 			"add",
 			"acquirem",
 			"add1",