A64: Synchronize with r16679.

ChangeLog

Index: ChangeLog
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+2013-09-12: Version 3.21.14
+
+        Added access check for observed objects.
+        (V8 issue 2778)
+
+        Cleaned up v8::ArrayBuffer::Allocator interface.
+        (V8 issue 2823)
+
+        Performance and stability improvements on all platforms.
+
+2013-09-11: Version 3.21.13
+
+        Added a ResourceConstraint for the embedder to specify that V8 is
+        running on a memory constrained device.
+        (Chromium issue 280984)
+
+        Removed HandleScope default ctor.
+        (Chromium issue 236173)
+
+        Enabled escape analysis for Hydrogen.
+
+        Correctly stringified mixed encoding indirect strings.
+        (Chromium issue 287476)
+
+        Performance and stability improvements on all platforms.
+
+
 2013-09-09: Version 3.21.12
 
         Fixed bitwise negation on x64.