cmd/compile/internal/types2: review of importer_test.go

This is a small helper file that provides a default importer
for the type checker tests. There is no go/types equivalent.

The actual change is removing the "// UNREVIEWED" marker.

Change-Id: Ic1f9858bdd9b818d9ddad754e072d9d14d8fb9b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/304252
Trust: Robert Griesemer <[email protected]>
Reviewed-by: Robert Findley <[email protected]>

Author: griesemer

src/cmd/compile/internal/types2/importer_test.go

@@ -1,4 +1,3 @@
-// UNREVIEWED
 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.