Prepare push to trunk. Now working on version 3.20.2.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/18324010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15447 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

+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.

src/version.cc

@@ -34,7 +34,7 @@
 // system so their names cannot be changed without changing the scripts.
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     20
-#define BUILD_NUMBER      1
+#define BUILD_NUMBER      2
 #define PATCH_LEVEL       0
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)