PR target/23473

	PR target/23473
	* arm.md (arm_load_pic_register): Change argument to the mask of
	saved registers.  Call thumb_find_work_register if we need a
	scratch register on Thumb.
	(arm_expand_prologue): Pass empty register set to
	arm_load_pic_register.
	(thumb_expand_prologue): Pass live_regs_mask directly to
	arm_load_pic_register.
	* arm-protos.h (arm_load_pic_register): Update prototype.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@103277 138bc75d-0d04-0410-961f-82ee72b054a4