[Bug sanitizer/112727] [11/12/13/14 Regression] UBSAN creates GIMPLE path with uninitialized variable

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112727

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> It has been added that way by Marek in
> r8-727-g6b6ae9eb9c06b6911573bb9a13cf98b5a7c98b78

Yet another option would be to keep it, but x = unshare_expr (r);
And perhaps first verify r doesn't have too many subtrees and punt in that
case, so that the unsharing doesn't result in huge IL in pathological cases.