[arm-embedded] Backport mainline 174803, 175208, 175427

[Joey Ye]

Backport from mainline to ARM/embedded-4_6-branch.

Committed.

2011-09-19  Jiangning Liu  <jiangning.liu@arm.com>

	Backport r175427 from mainline
	2011-06-27  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49169
	* fold-const.c (get_pointer_modulus_and_residue): Don't rely on
	the alignment of function decls.

2011-09-19  Jiangning Liu  <jiangning.liu@arm.com>

	Backport r175208 from mainline
	2011-06-20  Ramana Radhakrishnan  <ramana.radhakrishnan@linaro.org>

	PR target/49385
	* config/arm/thumb2.md (*thumb2_movhi_insn): Make sure atleast
	one of the operands is a register.

2011-09-19  Jiangning Liu  <jiangning.liu@arm.com>

	Backport r174803 from mainline
	2011-06-08  Julian Brown  <julian@codesourcery.com>

	* config/arm/arm.c (arm_libcall_uses_aapcs_base): Use correct ABI
	for double-precision helper functions in hard-float mode if only
	single-precision arithmetic is supported in hardware.