fold-const.c (fold_addr_of_array_ref_difference): Properly convert operands before folding a MINUS_EXPR.

2015-10-22  Richard Biener  <rguenther@suse.de>

	* fold-const.c (fold_addr_of_array_ref_difference): Properly
	convert operands before folding a MINUS_EXPR.
	(fold_binary_loc): Move simplification of MINUS_EXPR on
	converted POINTER_PLUS_EXPRs ...
	* match.pd: ... here.

	c/
	* c-typeck.c (c_finish_omp_clauses): Properly convert operands
	before folding a MINUS_EXPR.

	cp/
	* semantics.c (cp_finish_omp_clause_depend_sink): Properly convert
	before folding a MINUS_EXPR.
	(finish_omp_clauses): Likewise.

From-SVN: r229167