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=

Committed: http://code.google.com/p/v8/source/detail?r=7893

[Søren Thygesen Gjesse, 2011-05-16 08:38:08]

LGTM

I will commit it.