Cortex-R5 support

[Paul Brook]

The attached patch dds support for the ARM Cortex-R5 CPU.
The main relevant feature is that the integer division instructions are 
supported in both ARM and Thumb mode.  To achive this I've allowed the "idiv" 
architecture extension for both A and R base profiles.

Tested on arm-none-eabi
Applied to CVS head.

Paul

2011-05-31  Paul Brook  <paul@codesourcery.com>

	gas/
	* config/tc-arm.c (arm_cpus): Add Cortex-R5.
	(arm_extensions): Allow idiv on ARMv7-R.
	* doc/c-arm.text: Update idiv extension restrictions.

	gas/testsuite/
	* gas/arm/arm-idiv-bad.d: New test.
	* gas/arm/arm-idiv-bad.s: New test.
	* gas/arm/arm-idiv-bad.l: New test.
	* gas/arm/arm-idiv.d: New test.
	* gas/arm/arm-idiv.s: New test.

	include/
	* opcode/arm.h (ARM_ARCH_V7R_IDIV): Define.
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