tree-optimization/97151 - improve PTA for C++ operator delete

tree-optimization/97151 - improve PTA for C++ operator delete

C++ operator delete, when DECL_IS_REPLACEABLE_OPERATOR_DELETE_P,
does not cause the deleted object to be escaped.  It also has no
other interesting side-effects for PTA so skip it like we do
for BUILT_IN_FREE.

2020-09-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/97151
	* tree-ssa-structalias.c (find_func_aliases_for_call):
	DECL_IS_REPLACEABLE_OPERATOR_DELETE_P has no effect on
	arguments.

	* g++.dg/cpp1y/new1.C: Adjust for two more handled transforms.