Prepare push of version 2.2.3 to trunk.

Review URL: http://codereview.chromium.org/1619016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

+2010-04-14: Version 2.2.3
+
+        Added stack command and mem command to ARM simulator debugger.
+
+        Fixed scons snapshot and ARM build, and Windows X64 build issues.
+
+        Performance improvements on all platforms.
+
+
 2010-04-12: Version 2.2.2
 
         Introduced new profiler API.

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      3
+#define BUILD_NUMBER      4
 #define PATCH_LEVEL       0
 #define CANDIDATE_VERSION true