CodeStubs contain their corresponding Isolate* now. (part 2)

This CL mechanically removes all useless Isolate* parameters from code
stub functions, making things quite a bit simpler.

BUG=359977
LOG=y
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/255543003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20940 ce2b1a6d-e550-0410-aec6-3dcde31c8c00