Fix bug 1070: set correct holder for primitive checks.

test/mjsunit/string-charcodeat.js

 // Copyright 2008 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 /**
  * @fileoverview Check all sorts of borderline cases for charCodeAt.
  */
-
 function Cons() {
   return "Te" + "st testing 123";
 }
 
 
 function Deep() {
   var a = "T";
   a += "e";
   a += "s";
   a += "ting testing 123";
@@ skipping 156 matching lines @@
 
 assertTrue(isNaN(medium.charCodeAt(-1)), 31);
 assertEquals(49, medium.charCodeAt(0), 32);
 assertEquals(56, medium.charCodeAt(255), 33);
 assertTrue(isNaN(medium.charCodeAt(256)), 34);
 
 assertTrue(isNaN(long.charCodeAt(-1)), 35);
 assertEquals(49, long.charCodeAt(0), 36);
 assertEquals(56, long.charCodeAt(65535), 37);
 assertTrue(isNaN(long.charCodeAt(65536)), 38);
+
+
+// Test crankshaft code when the function is set directly on the
+// string prototype object instead of the hidden prototype object.
+// See http://code.google.com/p/v8/issues/detail?id=1070
+
+String.prototype.x = String.prototype.charCodeAt;
+
+function directlyOnPrototype() {
+  assertEquals(97, "a".x(0));
+  assertEquals(98, "b".x(0));
+  assertEquals(99, "c".x(0));
+}
+
+for (var i = 0; i < 10000; i++) {
+  directlyOnPrototype();
+}