MIPS: Update for 23-May commits, and a few older ones.
Make mips-specifc changes for r7999, r8001, r8002.
Also bring in changes for older commits 7203, 7279, 7693, 7715, 7788.
Mips changes for 7715 (Arm: Support hardfloat in SCons build), and
7693 (Implement hardfloat calling convention in macro assembler and simulator)
resulted in changes to SConstruct.
BUG=
TEST=
Review URL: http://codereview.chromium.org//
6966031
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8022
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00