Reviewers: Erik Corry,

Description:
ARM: Add Ldrd/Strd to the macro assembler

The macro assembler now checks for ARMv7 support and generates instructions for Ldrd/Strd accordingly. INstructions ldrd/strd in the assembler requires ARMv7 support enabled. This removes the a check for CAN_USE_ARMV7_INSTRUCTIONS making the ARMv7 support in the simulator fully controled by the --enable-armv7 flag.

Please review this at http://codereview.chromium.org/2226003/show

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

Affected files:
  M     src/arm/assembler-arm.cc
  M     src/arm/codegen-arm.cc
  M     src/arm/full-codegen-arm.cc
  M     src/arm/macro-assembler-arm.h
  M     src/arm/macro-assembler-arm.cc


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