[arm-embedded] Backport trunk Cortex-M4 FPU tuning to embedded-4_8-branch

[Terry Guo]

Hi,

This patch back ported a trunk cortex-m4 FPU tuning to embedded-4_8-branch.

BR,
Terry

gcc/ChangeLog.arm
2013-11-28  Terry Guo  <terry.guo@arm.com>
 
	Backport mainline r198084
	2013-04-19  Terry Guo  <terry.guo@arm.com>

	* config/arm/cortex-m4-fpu.md (cortex_m4_v): Delete cpu unit.
	Replace with ...
	(cortex_m4_v_a,  cortex_m4_v_b): ... new cpu units.
	(cortex_m4_v, cortex_m4_exa_va, cortex_m4_exb_vb): New reservations.
	(cortex_m4_fmacs): Use new reservations.
	(cortex_m4_f_load, cortex_m4_f_store): Likewise.
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