The trap instruction is intercepted by various runtime environments,
and instead of a crash it creates confusion.
This reapplies r354606 with a fix.
llvm-svn: 354611
Add a common -trap-unreachable option, similar to the target
specific hexagon equivalent, which has been replaced. This
turns unreachable instructions into traps, which is useful for
debugging.
Differential Revision: https://reviews.llvm.org/D42965
llvm-svn: 324880
Krzysztof Parzyszek