[arm-embedded] Backport mainline

[Joey Ye]

Backport mainline r174578 & r174577 to ARM/embedded-4_6-branch.

Committed.

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

	Backport r174578 from mainline
	2011-06-02  Julian Brown  <julian@codesourcery.com>

	* config/arm/arm-cores.def (arm1156t2-s, arm1156t2f-s): Use v6t2
	tuning.
	* config/arm/arm-protos.h (tune_params): Add branch_cost hook.
	* config/arm/arm.c (arm_default_branch_cost): New.
	(arm_slowmul_tune, arm_fastmul_tune, arm_xscale_tune, arm_9e_tune)
	(arm_v6t2_tune, arm_cortex_tune, arm_cortex_a9_tune)
	(arm_fa726_tune): Set branch_cost field using
	arm_default_branch_cost.
	* config/arm/arm.h (BRANCH_COST): Use branch_cost hook from
	current_tune structure.
	* dojump.c (tm_p.h): Include file.

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

	Backport r174577 from mainline
	2011-06-02  Julian Brown  <julian@codesourcery.com>

	* arm-cores.def (arm1156t2-s, arm1156t2f-s): Use v6t2 tuning.
	(cortex-a5, cortex-a8, cortex-a15, cortex-r4, cortex-r4f, cortex-m4)
	(cortex-m3, cortex-m1, cortex-m0): Use cortex tuning.
	* config/arm/arm-protos.h (tune_params): Add prefer_constant_pool
	field.
	* config/arm/arm.c (arm_slowmul_tune, arm_fastmul_tune)
	(arm_xscale_tune, arm_9e_tune, arm_cortex_a9_tune)
	(arm_fa726te_tune): Add prefer_constant_pool setting.
	(arm_v6t2_tune, arm_cortex_tune): New.
	* config/arm/arm.h (TARGET_USE_MOVT): Make dependent on
	prefer_constant_pool setting.