[Bug target/93605] GCC suboptimal tail call optimization in trivial function forwarding with __attribute__((noinline))

[mike.k at digitalcarbide dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93605

--- Comment #2 from mike.k at digitalcarbide dot com ---
Interestingly, changing `impl::func`'s signature from `bool v` to `auto&& v`
fixes the issue. Changing it to `auto v` does not.