[Bug inline-asm/66631] inability to clobber segment regs makes tls problematic

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66631

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also why can't you write your segfault handler in assembly when you fixup the
fs segment and then call the C functions?