PR middle-end/32628

	PR middle-end/32628
	* c-common.c (pointer_int_sum): Disregard overflow that occured only
	because of sign-extension change when converting to sizetype here...
	* fold-const.c (fold_convert_const_int_from_int): ...and not here.

	* fold-const.c (fold_binary_op_with_conditional_arg): Do not restrict
	the folding to constants.  Remove redundant final conversion.
	(fold_binary) <associate>: Do not associate if the re-association of
	constants alone overflows.
	(fold_binary) <FLOOR_MOD_EXPR>: Move transformation into BIT_AND_EXPR
	to the end of the list.
	(multiple_of_p) <COND_EXPR>: New case.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@158274 138bc75d-0d04-0410-961f-82ee72b054a4