This patch makes TRULY_NOOP_TRUNCATION take the mode sizes as
poly_uint64s instead of unsigned ints.  The function bodies
don't need to change.

2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
            Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* target.def (truly_noop_truncation): Take poly_uint64s instead of
	unsigned ints.  Change default to hook_bool_puint64_puint64_true.
	* doc/tm.texi: Regenerate.
	* hooks.h (hook_bool_uint_uint_true): Delete.
	(hook_bool_puint64_puint64_true): Declare.
	* hooks.c (hook_bool_uint_uint_true): Delete.
	(hook_bool_puint64_puint64_true): New function.
	* config/mips/mips.c (mips_truly_noop_truncation): Take poly_uint64s
	instead of unsigned ints.
	* config/spu/spu.c (spu_truly_noop_truncation): Likewise.
	* config/tilegx/tilegx.c (tilegx_truly_noop_truncation): Likewise.

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

From-SVN: r255866