Correctly escape RegExp source.

test/mjsunit/compiler/literals.js

 // Copyright 2009 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 20 matching lines @@
 assertEquals(null, eval("null"));
 
 assertEquals("abc", eval("'abc'"));
 
 assertEquals(8, eval("6;'abc';8"));
 
 // Characters just outside the ranges of hex-escapes.
 // "/" comes just before "0".
 assertThrows('"\\x1/"');
 assertThrows('"\\u111/"');
-assertEquals("\\x1/", RegExp("\\x1/").source);
-assertEquals("\\u111/", RegExp("\\u111/").source);
+assertEquals("\\x1\\/", RegExp("\\x1/").source);
+assertEquals("\\u111\\/", RegExp("\\u111/").source);
 
 // ":" comes just after "9".
 assertThrows('"\\x1:"');
 assertThrows('"\\u111:"');
 assertEquals("\\x1:", /\x1:/.source);
 assertEquals("\\u111:", /\u111:/.source);
 
 // "`" comes just before "a".
 assertThrows('"\\x1`"');
 assertThrows('"\\u111`"');
@@ skipping 31 matching lines @@
 assertEquals([2,4,6,8], eval(s));
 
 // Test array literals in effect context.
 assertEquals(17, eval('[1,2,3,4]; 17'));
 assertEquals(19, eval('var a=1, b=2; [a,b,3,4]; 19'));
 assertEquals(23, eval('var a=1, b=2; c=23; [a,b,3,4]; c'));
 
 // Test that literals work for non-smi indices.
 // Ensure hash-map collision if using value as hash.
 var o = {"2345678901" : 42, "2345678901" : 30};