[33/77] Add a NARROWEST_INT_MODE macro

[33/77] Add a NARROWEST_INT_MODE macro

This patch replaces uses of GET_CLASS_NARROWEST_MODE (MODE_INT) with a
new NARROWEST_INT_MODE macro, which has type scalar_int_mode.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* machmode.h (NARROWEST_INT_MODE): New macro.
	* expr.c (alignment_for_piecewise_move): Use it instead of
	GET_CLASS_NARROWEST_MODE (MODE_INT).
	(push_block): Likewise.
	* stor-layout.c (bit_field_mode_iterator::bit_field_mode_iterator):
	Likewise.
	* tree-vrp.c (simplify_float_conversion_using_ranges): Likewise.

gcc/ada/
	* gcc-interface/decl.c (validate_size): Use NARROWEST_INT_MODE
	instead of GET_CLASS_NARROWEST_MODE (MODE_INT).

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r251485