[Bug target/124021] Interrupt function may clobber vstart on riscv

[law at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124021

--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Typically an interrupt attribute wouldn't be used for user space code on a
linux system (as an example).  It's much more likely to be used in a bare metal
environment where someone is actually writing a true interrupt handler.