Prepare push to trunk. Now working on version 3.12.19.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10825076

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12225 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

+2012-07-30: Version 3.12.18
+
+        Forced using bit-pattern for signed zero double. (issue 2239)
+
+        Made sure double to int conversion is correct. (issue 2260)
+
+        Performance and stability improvements on all platforms.
+
+
 2012-07-27: Version 3.12.17
 
         Always set the callee's context when calling a function from optimized

src/version.cc

@@ -34,7 +34,7 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     12
-#define BUILD_NUMBER      18
+#define BUILD_NUMBER      19
 #define PATCH_LEVEL       0
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)