A64: Synchronize with r18764.

ChangeLog

Index: ChangeLog
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+2014-01-22: Version 3.24.21
+
+        Performance and stability improvements on all platforms.
+
+
+2014-01-21: Version 3.24.20
+
+        ES6: Implement Object.setPrototypeOf (issue 2675).
+
+        Performance and stability improvements on all platforms.
+
+
+2014-01-20: Version 3.24.19
+
+        Introduce a setting to control the toolset for which d8 is compiled
+        (issue 1775).
+
+        Performance and stability improvements on all platforms.
+
+
+2014-01-17: Version 3.24.18
+
+        Performance and stability improvements on all platforms.
+
+
 2014-01-16: Version 3.24.17
 
         Make cells pointing to JSObjects weak in optimized code (issue 2073).