Disable extra checks in Release mode.

They caused test failures and performance regressions.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/16158002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14856 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/common.gypi

@@ -445,7 +445,7 @@
       },  # Debug
       'Release': {
         'variables': {
-          'v8_enable_extra_checks%': 1,
+          'v8_enable_extra_checks%': 0,
         },
         'conditions': [
           ['v8_enable_extra_checks==1', {