poly_int: reload1.c

poly_int: reload1.c

This patch makes a few small poly_int64 changes to reload1.c,
mostly related to eliminations.  Again, there's no real expectation
that reload will be used for targets that have polynomial-sized modes,
but it seemed easier to convert it anyway.

2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* reload1.c (elim_table): Change initial_offset, offset and
	previous_offset from HOST_WIDE_INT to poly_int64_pod.
	(offsets_at): Change the target array's element type from
	HOST_WIDE_INT to poly_int64_pod.
	(set_label_offsets, eliminate_regs_1, eliminate_regs_in_insn)
	(elimination_costs_in_insn, update_eliminable_offsets)
	(verify_initial_elim_offsets, set_offsets_for_label)
	(init_eliminable_invariants): Update after above changes.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255916