Mode clean-up pt 1: rename classic/non-strict mode to sloppy mode

test/mjsunit/regress/regress-2564.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
 var o = [ function f0() { throw new Error(); },
           function f1() { o[0](); },
           function f2() { "use strict"; o[1](); },
           function f3() { o[2](); } ];
 
 Error.prepareStackTrace = function(error, frames) {
   Error.prepareStackTrace = undefined;  // Prevent recursion.
   try {
     assertEquals(5, frames.length);
     for (var i = 0; i < 2; i++) {
-      // The first two frames are still classic mode.
+      // The first two frames are still sloppy mode.
       assertEquals(o[i], frames[i].getFunction());
       assertEquals(o, frames[i].getThis());
     }
     for (var i = 2; i < frames.length; i++) {
       // The rest are poisoned by the first strict mode function.
       assertEquals(undefined, frames[i].getFunction());
       assertEquals(undefined, frames[i].getThis());
     }
     for (var i = 0; i < frames.length - 1; i++) {
       // Function name remains accessible.
@@ skipping 33 matching lines @@
   } catch (e) {
     return e;
   }
 }
 
 try {
   o[3]();
 } catch (e) {
   assertEquals("success", e.stack);
 };