c++: Set CALL_FROM_NEW_OR_DELETE_P on more calls.

c++: Set CALL_FROM_NEW_OR_DELETE_P on more calls.

We were failing to set the flag on a delete call in a new expression, in a
deleting destructor, and in a coroutine.  Fixed by setting it in the
function that builds the call.

2020-10-02  Jason Merril  <jason@redhat.com>

gcc/cp/ChangeLog:
	* call.c (build_operator_new_call): Set CALL_FROM_NEW_OR_DELETE_P.
	(build_op_delete_call): Likewise.
	* init.c (build_new_1, build_vec_delete_1, build_delete): Not here.
	(build_delete):

gcc/ChangeLog:
	* gimple.h (gimple_call_operator_delete_p): Rename from
	gimple_call_replaceable_operator_delete_p.
	* gimple.c (gimple_call_operator_delete_p): Likewise.
	* tree.h (DECL_IS_REPLACEABLE_OPERATOR_DELETE_P): Remove.
	* tree-ssa-dce.c (mark_all_reaching_defs_necessary_1): Adjust.
	(propagate_necessity): Likewise.
	(eliminate_unnecessary_stmts): Likewise.
	* tree-ssa-structalias.c (find_func_aliases_for_call): Likewise.

gcc/testsuite/ChangeLog:
	* g++.dg/pr94314.C: new/delete no longer omitted.