[Patch ARM] Add predefine for availability of DSP multiplication functions.

[James Greenhalgh]

Hi,

This patch adds a builtin macro __ARM_FEATURE_DSP which is defined
when the ARMv5E DSP multiplication extensions are available for use.

Thanks,
James Greenhalgh

2011-06-22  James Greenhalgh  <james.greenhalgh@arm.com>

	* TARGET_CPU_CPP_BUILTINS: Add __ARM_FEATURE_DSP.
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