Cleanup: Move mjsunit/regress-*.js into mjsunit/regress/.

test/mjsunit/regress-crbug-619476.js

Index: test/mjsunit/regress-crbug-619476.js
diff --git a/test/mjsunit/regress-crbug-619476.js b/test/mjsunit/regress-crbug-619476.js
deleted file mode 100644
index 33204ae7739950dee3a170d670df92d4305e0819..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress-crbug-619476.js
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var x = {};
-// Crashes in debug mode if an erroneous DCHECK in dfb8d333 is not removed.
-eval, x[eval];