A64: Synchronize with r15545.

ChangeLog

Index: ChangeLog
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+2013-07-08: Version 3.20.3
+
+        Performance and stability improvements on all platforms.
+
+
+2013-07-05: Version 3.20.2
+
+        Remove deprecated heap profiler methods from V8 public API
+
+        Mark i18n functions as native and set proper names
+        (issue 2745)
+
+        Correctly report stack trace when current function is FunctionApply
+        builtin (Chromium issue 252097)
+
+        Enable GDBJIT interface for standalone by default.
+
+        Fix debuggersupport=off build. (issue 2754)
+
+        Introduce -m64 flag for making x64 when the default gcc compiler is for
+        X32
+
+        Performance and stability improvements on all platforms.
+
+
+2013-07-02: Version 3.20.1
+
+        Implemented WeakMap.prototype.clear function. (issue 2753)
+
+        Ensure CheckInitialized is present independent of define.
+        (Chromium issue 255779)
+
+        Performance and stability improvements on all platforms.
+
+
+2013-06-28: Version 3.20.0
+
+        Migrated several tests from blink to V8 repository.
+
+        Allowed users of the V8 API to distinguish between unset and undefined
+        HiddenValues (issue 2746).
+
+        Deprecated old style callbacks in the V8 API.
+
+        Turned on parallel recompilation.
+
+        Performance and stability improvements on all platforms.
+
+
 2013-06-18: Version 3.19.18
 
 	Fixed read-only attribute of Function.length in strict mode.