Port r11332 (0e6df8b6)

Original commit message:
Refactor code generation for global declarations.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10041029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11373 ce2b1a6d-e550-0410-aec6-3dcde31c8c00