PR c++/63619

gcc/cp:
	PR c++/63619
	* decl2.c (delete_sanity): Use OPT_Wdelete_incomplete in warning.

gcc/testsuite:
	PR c++/63619
	* g++.dg/warn/Wdelete-incomplete-3.C: New.
	* g++.dg/warn/Wdelete-incomplete-4.C: New.

From-SVN: r216599