Update V8 to r5136 as required by WebKit r64264

Change-Id: I55b86fa101d9d53e889e2e3811fdf75f463ac3c6
diff --git a/src/objects.h b/src/objects.h
index 2b64611..a5d7860 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -39,7 +39,7 @@
 #endif
 
 //
-// All object types in the V8 JavaScript are described in this file.
+// Most object types in the V8 JavaScript are described in this file.
 //
 // Inheritance hierarchy:
 //   - Object
@@ -74,8 +74,8 @@
 //           - CodeCacheHashTable
 //           - MapCache
 //         - Context
-//         - GlobalContext
 //         - JSFunctionResultCache
+//         - SerializedScopeInfo
 //       - String
 //         - SeqString
 //           - SeqAsciiString
@@ -2725,7 +2725,7 @@
   };
 
   enum {
-    NUMBER_OF_KINDS = KEYED_STORE_IC + 1
+    NUMBER_OF_KINDS = LAST_IC_KIND + 1
   };
 
 #ifdef ENABLE_DISASSEMBLER