[arm-embedded] Tune branch cost for armv7-m

[Joey Ye]

Committed in ARM/embedded-4_6-branch.

2011-09-20  Jiangning Liu  <jiangning.liu@arm.com>

	Tune branch cost for armv7-m
	* config/arm/arm-cores.def (cortex-m3): Use cortex-v7m.
	(cortex-m4) : Likewise.
	* config/arm/arm.c (arm_cortex_v7m_branch_cost): New.
	(arm_cortex_v7m_tune): New.

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