poly_int: dump routines

poly_int: dump routines

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

gcc/
	* dumpfile.h (dump_dec): Declare.
	* dumpfile.c (dump_dec): New function.
	* pretty-print.h (pp_wide_integer): Turn into a function and
	declare a poly_int version.
	* pretty-print.c (pp_wide_integer): New function for poly_ints.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255864