[arm-embedded] Tune loop unrolling for cortex-m

[Joey Ye]

Committed in ARM/embedded-4_6-branch.

2011-09-21  Jiangning Liu  <jiangning.liu@arm.com>

	Tune loop unrolling for cortex-m
	* config/arm/arm-cores.def (cortex-m0): Change to new tune
	cortex_v6m.
	(cortex-m1): Likewise.
	* config/arm/arm-protos.h (max_unroll_times): New.
	* config/arm/arm.c (arm_default_unroll_times): New.
	(arm_cortex_m_unroll_times): New.
	(arm_cortex_v6m_tune): New.
	(arm_slowmul_tune): Add max_unroll_times function pointer.
	(arm_fastmul_tune, arm_xscale_tune, arm_9e_tune, 
	arm_v6t2_tune, arm_cortex_tune, arm_cortex_a9_tune,
	arm_cortex_v7m_tune, arm_cortex_v6m_tune,
	arm_fa726te_tune): Likewise.
	(arm_option_override): Enable loop unroll for all all M class
	Cores, if optimization level is >= 1.
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