[Bug c++/33661] template methods forget explicit local register asm vars

[adobriyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33661

--- Comment #15 from Alexey Dobriyan <adobriyan at gmail dot com> ---
I can only reconfirm this bug still exists with 8.2.0 after rediscovering it
independently.

Linux system calls taking 4+ arguments can't be templatized as they require

    register T3 _a3 asm("r10") = a3;


But using

    "r10" (a3)

in assembly input constraints doesn't work either.