Update V8 to r7079 as required by WebKit r80534.

Change-Id: I487c152e485d5a40b68997d7c0d2f1fba5da0834
diff --git a/test/mjsunit/mjsunit.js b/test/mjsunit/mjsunit.js
index 558282f..fe580f3 100644
--- a/test/mjsunit/mjsunit.js
+++ b/test/mjsunit/mjsunit.js
@@ -104,6 +104,13 @@
 }
 
 
+function assertSame(expected, found, name_opt) {
+  if (found !== expected) {
+    fail(expected, found, name_opt);
+  }
+}
+
+
 function assertEquals(expected, found, name_opt) {
   if (!deepEquals(found, expected)) {
     fail(expected, found, name_opt);