[Bug c++/77312] Lambda that deletes itself accesses freed memory, but only if class is templated

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77312

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It all comes down to this statement:
delete this;

The C++ front-end expands it as:

  [t33.cc:28:39] D.3592 = [t33.cc:28:39] __closure->__this;
  [t33.cc:28:41] LambdaHolder<int>::~LambdaHolder (D.3592);
  [t33.cc:28:39] D.3592 = [t33.cc:28:39] __closure->__this;
  [t33.cc:28:41] operator delete (D.3592, 360);


Notice how it reads from __closure here but __closure is deleted during the
call to ~LambdaHolder.

So the question comes what is the semantics of:
delete XYZ;

Inside a lambda where XYZ is captured?  Do we need to read from the closure
twice, once for the deconstructor and then again for the call to delete.