Check unaligned pointer conversion and strip NOPS.

gcc/c-family/

	PR c/51628
	PR c/88664
	* c-common.h (warn_for_address_or_pointer_of_packed_member):
	Remove the boolean argument.
	* c-warn.c (check_address_of_packed_member): Renamed to ...
	(check_address_or_pointer_of_packed_member): This.  Also
	warn pointer conversion.
	(check_and_warn_address_of_packed_member): Renamed to ...
	(check_and_warn_address_or_pointer_of_packed_member): This.
	Also warn pointer conversion.
	(warn_for_address_or_pointer_of_packed_member): Remove the
	boolean argument.  Don't check pointer conversion here.

gcc/c

	PR c/51628
	PR c/88664
	* c-typeck.c (convert_for_assignment): Upate the
	warn_for_address_or_pointer_of_packed_member call.

gcc/cp

	PR c/51628
	PR c/88664
	* call.c (convert_for_arg_passing): Upate the
	warn_for_address_or_pointer_of_packed_member call.
	* typeck.c (convert_for_assignment): Likewise.

gcc/testsuite/

	PR c/51628
	PR c/88664
	* c-c++-common/pr51628-33.c: New test.
	* c-c++-common/pr51628-35.c: New test.
	* c-c++-common/pr88664-1.c: Likewise.
	* c-c++-common/pr88664-2.c: Likewise.
	* gcc.dg/pr51628-34.c: Likewise.

From-SVN: r268075