tree-object-size: Drop unused pdecl and poff arguments

tree-object-size: Drop unused pdecl and poff arguments

The pdecl and poff arguments were added to allow their use in
compute_objsize in builtins.c.  That use has been gone for a while now
since compute_objsize does its own size estimation, so drop these
arguments to simplify code.

gcc/ChangeLog:

	* tree-object-size.c (addr_object_size,
	compute_builtin_object_size): Drop PDECL and POFF arguments.
	(addr_object_size): Adjust calls.
	* tree-object-size.h (compute_builtin_object_size): Drop PDECL
	and POFF arguments.

Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>