[Bug tree-optimization/93745] Redundant store not eliminated with intermediate instruction

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93745

--- Comment #12 from Jeffrey A. Law <law at redhat dot com> ---
It would seem like C ought to be able to set the flag across the board.  But
Richi would know best if this is going to run afoul of of the alias oracle
implementation & underlying gimple semantics.

I vaguely recall a discussion on the lists WRT how to represent placement-new. 
I didn't follow it at the time.  Without reviewing the thread it does seem
helpful if we could see the placement-new in the IL.