MIPS: pre-crankshaft updates to assembler and related files. (1/3)

MIPS: pre-crankshaft updates to assembler and related files. (1/3)

Highlights:
- assembler.h adds FPU definitions used for Crankshaft.
- Support optimization of mips call: jalr->jal
    - includes changes to  set_target_address_at(), support routines.
    - Add 2nd use of Apply() to update target addresses.
- Minor debugging improvement in simulator.

BUG=
TEST=

Review URL: http://codereview.chromium.org/7888003
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9259 ce2b1a6d-e550-0410-aec6-3dcde31c8c00