[PATCH] D18041: [ELF] use fatal() instead of llvm_unreachable when performing relaxations.

[George Rimar via llvm-commits]

>How does using assert help? llvm_unreachable(msg) is basically assert(0 && msg);

Nohow, sorry, for some reason I thought it has form with Twine& argument, 
was confused it with error().

Then possible solution looks a bit ugly for me:
llvm_unreachable((Twine("Unknown TLS optimization: ") + Twine(Type)).str().c_str());

>Cheers,
>Rafael