Get rid of ContextualMode for call ICs.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/137083002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18594 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove HCallGlobal and merge uses with HCallNamed.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/134333007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18595 ce2b1a6d-e550-0410-aec6-3dcde31c8c00