Prepare push to trunk. We are now working on version 2.2.21.

Review URL: http://codereview.chromium.org/2882002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4961 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

+2010-06-28: Version 2.2.20
+        Fix bug with for-in on x64 platform (issue 748).
+
+        Fix crash bug on x64 platform (issue 756).
+        
+        Fix bug in Object.getOwnPropertyNames. (chromium issue 41243).
+
+        Fix a bug on ARM  that caused the result of 1 << x to be 
+        miscalculated for some inputs.
+
+        Performance improvements on all platforms.
+
 2010-06-23: Version 2.2.19
 
         Fix bug that causes the build to break when profillingsupport=off

src/version.cc

@@ -34,7 +34,7 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     2
 #define MINOR_VERSION     2
-#define BUILD_NUMBER      20
+#define BUILD_NUMBER      21
 #define PATCH_LEVEL       0
 #define CANDIDATE_VERSION true