Get rid of HLinkObjectInList.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/21345002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15983 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Avoid the use of set_type() in instruction constructors.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/21348002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15984 ce2b1a6d-e550-0410-aec6-3dcde31c8c00