Refactoring BuildAllocateElements.

BUG=

Review URL: https://codereview.chromium.org/13693004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14147 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix minor typo in generator parsing test.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/13575010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14148 ce2b1a6d-e550-0410-aec6-3dcde31c8c00