MIPS: Refactoring InterfaceDescriptors away from code-stubs.h - external.

MIPS: Refactoring InterfaceDescriptors away from code-stubs.h - external.

Port r23515 (fe0bdbf)

Original commit message:
Clean up and create seperation between the concept of a call descriptor and a
code stub interface descriptor. The former is just concerned with how to call,
but the latter has many extra hints related to code generation and
deoptimization for the implementation of a particular code stub.

BUG=
R=paul.lind@imgtec.com, vogelheim@chromium.org

Review URL: https://codereview.chromium.org/516253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23525 ce2b1a6d-e550-0410-aec6-3dcde31c8c00