[Bug gdb/28486] [riscv64] GDB doesn't allow stepping over cbreak trap instruction

[wilson at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28486

--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
On IRC, Jessica Clarke suggested that gcc could use unimp for a program ending
trap, thus leaving ebreak for user breakpoints.  I think we are already using
unimp for something else (padding bytes in text?), but that probably doesn't
conflict with the new proposed use.

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