[Bug ipa/70760] [6/7 regression] wrong generated code for std::make_unique with -fipa-pta

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70760

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
First DCE after IPA PTA does

@@ -18217,7 +9762,6 @@
   MEM[(struct ParameterDescription
*)_5].D.481734.D.343802._vptr.ParameterDescriptionNode = &MEM[(void
*)&_ZTVN3edm20ParameterDescriptionIiEE + 16B];
   _18 = *__args#1_7(D);
   MEM[(struct ParameterDescription *)_5].value_ = _18;
-  MEM[(struct _Head_base *)_1(D)]._M_head_impl = _5;
   return _1(D);

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