A64: Synchronize with r16756.

ChangeLog

Index: ChangeLog
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+2013-09-16: Version 3.21.16
+
+        Every place where AllocationMemento is initialized with an
+        AllocationSite is now checked to be sure a valid Site goes in. This is
+        temporary code to diagnose chromium bug 284577.
+
+        Performance and stability improvements on all platforms.
+
+
+2013-09-13: Version 3.21.15
+
+        Non-JSObject heap objects are now handled using slow-path IC stub
+        guarded by the map.
+        (Chromium issue 280632)
+
+        i18n Javascript code added to the snapshot.
+        (V8 issue 2745)
+
+        Performance and stability improvements on all platforms.
+
 2013-09-12: Version 3.21.14
 
         Added access check for observed objects.