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

test/mjsunit/harmony/block-let-declaration.js

Index: test/mjsunit/harmony/block-let-declaration.js
diff --git a/test/mjsunit/harmony/block-let-declaration.js b/test/mjsunit/harmony/block-let-declaration.js
index 480e03348926e476cf21dcfc09300a392117aee5..4ddeefdbaaba22774037d57b270777004a07b63f 100644
--- a/test/mjsunit/harmony/block-let-declaration.js
+++ b/test/mjsunit/harmony/block-let-declaration.js
@@ -109,9 +109,9 @@ TestLocalDoesNotThrow("switch (true) { case true: var x; }");
 TestLocalDoesNotThrow("switch (true) { default: var x; }");
 
 // Test function declarations in source element and
-// non-strict statement positions.
+// sloppy statement positions.
 function f() {
-  // Non-strict source element positions.
+  // Sloppy source element positions.
   function g0() {
     "use strict";
     // Strict source element positions.