[Bug c/96597] valgrind error in do_hoist_insertion during O3 build

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96597

--- Comment #6 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 49056
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49056&action=edit
C source code

Reduced code attached.