Reviewers: danno, Jakob, ulan, Yang, paul.l..., gergely.kis.imgtec, akos.palfi.imgtec, balazs.kilvady,

Description:
MIPS: Add support for arch. revision 6 to mips32 port.

Additional summary:
 - Introduce fp64 fpu mode into mips32 port required for r6.
 - Implement runtime detections for fpu mode and arch. revision to preserve
   compatibility with previous architecture revisions.

TEST=
BUG=

Please review this at https://codereview.chromium.org/453043002/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+2602, -613 lines):
  M build/toolchain.gypi
  M src/base/atomicops_internals_mips_gcc.h
  M src/base/cpu.h
  M src/base/cpu.cc
  M src/globals.h
  M src/mips/assembler-mips.h
  M src/mips/assembler-mips.cc
  M src/mips/code-stubs-mips.cc
  M src/mips/codegen-mips.cc
  M src/mips/constants-mips.h
  M src/mips/constants-mips.cc
  M src/mips/disasm-mips.cc
  M src/mips/full-codegen-mips.cc
  M src/mips/lithium-codegen-mips.cc
  M src/mips/lithium-mips.h
  M src/mips/lithium-mips.cc
  M src/mips/macro-assembler-mips.h
  M src/mips/macro-assembler-mips.cc
  M src/mips/simulator-mips.h
  M src/mips/simulator-mips.cc
  M test/cctest/test-assembler-mips.cc
  M test/cctest/test-disasm-mips.cc


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