PR fortran/45636
	* tree-ssa-forwprop.c: Include expr.h.
	(constant_pointer_difference, simplify_builtin_call): New functions.
	(tree_ssa_forward_propagate_single_use_vars): Call
	simplify_builtin_call on builtin calls.

	* gcc.c-torture/execute/pr45636.c: New test.
	* gfortran.dg/pr45636.f90: New test.

From-SVN: r165401