[Bug c/103887] -fsanitize=shift affects constness of an expression

[mike@mk-sys.cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103887

--- Comment #2 from Michal Kubecek <mike@mk-sys.cz> ---
(In reply to Andrew Pinski from comment #1)
> The problem is rather __builtin_constant_p not resolving to a constant. This
> is a dup of bug 79482.

There is a difference: your modified testcase fails to compile regardless of
-fsanitize=shift while mine fails only with this option and succeeds without
it. If __builtin_constant_p(tr) not being handled as constant were the problem,
the result should not depend on presence of "-fsanitize=shift".