[Bug c++/110835] -fsanitize=address causes slowdown from std::rethrow_exception not called

[ed at catmur dot uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110835

--- Comment #1 from Ed Catmur <ed at catmur dot uk> ---
Motivation is
https://github.com/boostorg/exception/blob/b039b4ea18ef752d0c1684b3f715ce493b778060/include/boost/exception/detail/exception_ptr.hpp#L550
; the half-reduced code is:

#include <boost/exception_ptr.hpp>
struct S {};
int main() {
    auto ep = boost::copy_exception(S());
    for (int i = 0; i != 100000; ++i)
        try { boost::rethrow_exception(ep); } catch (...) {}
}