[Bug rtl-optimization/64037] Miscompilation with LTO and enum class : char parameter

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64037

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
This may fail on all targets where WORD_REGISTER_OPERATIONS isn't defined.