Handlify GetElementWithReceiver and GetElementWithInterceptor.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/210763003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20230 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Only assign environments when they are actually needed. (ia32 only)

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/210783003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20231 ce2b1a6d-e550-0410-aec6-3dcde31c8c00