thumb2.md (thumb2_movsi_insn): Split ldr and str alternatives according to use...

thumb2.md (thumb2_movsi_insn): Split ldr and str alternatives according to use of high and low regs.

	gcc/
	* config/arm/thumb2.md (thumb2_movsi_insn): Split ldr and str
	alternatives according to use of high and low regs.
	* config/arm/vfp.md (thumb2_movsi_vfp): Likewise.
	* config/arm/arm.h (CONDITIONAL_REGISTER_USAGE): Use high regs when
	optimizing for size on Thumb-2.


Co-Authored-By: Julian Brown <julian@codesourcery.com>

From-SVN: r158378