re PR target/68535 (arm.c: 5 * set but not used)

re PR target/68535 (arm.c: 5 * set but not used)

2017-06-28  Michael Collison  <michael.collison@arm.com>

	PR target/68535
	* config/arm/arm.c (gen_ldm_seq): Remove last unnecessary
	set of base_reg
	(arm_gen_movmemqi): Removed unused variable 'i'.
	Convert 'for' loop into 'while' loop.
	(arm_expand_prologue): Remove last unnecessary set of insn.
	(thumb_pop): Remove unused variable 'pushed_words'.
	(thumb_exit): Remove last unnecessary set of regs_to_pop.

From-SVN: r249721