poly_int: emit_group_load/store

poly_int: emit_group_load/store

This patch changes the sizes passed to emit_group_load and
emit_group_store from int to poly_int64.

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

gcc/
	* expr.h (emit_group_load, emit_group_load_into_temps)
	(emit_group_store): Take the size as a poly_int64 rather than an int.
	* expr.c (emit_group_load_1, emit_group_load): Likewise.
	(emit_group_load_into_temp, emit_group_store): Likewise.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255925