Submit code-stubs-mips.cc.

Submit code-stubs-mips.cc.

This submission required a small change to arch-indep code to declare
code stub DirectCEntry for mips.

It also required updates to macro-assembler-mips.cc & h and frames-mips.h.

I also made a small change to frames-mips.cc.

This code submission will compile, but is not testable until the majority
of the mips port is in place. It has been tested externally.

BUG=
TEST=

Review URL: http://codereview.chromium.org//7034008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7893 ce2b1a6d-e550-0410-aec6-3dcde31c8c00