Issues stopping us from removing libcall notes

[Steven Bosscher]

Hello,

Every time someone brings up the idea to remove libcall notes, people
have to think really hard why GCC still has them.  It seemed like a
good idea to record and collect these issues in a meta-bug. Thus, see
PR35413.  Please open a new bug report (enhancement request, probably)
for things that GCC still needs libcalls for, and make your new bug
report block PR34513.  Of course, it'd help if you then go on and
remove that dependency on libcall notes ;-)

Gr.
Steven