[llvm] r204404 - Remove llvm-mc's disable-cfi option.

[Rafael Espíndola]

> Isn't this actually theoretically useful for testing the bytes we emit
> from .cfi directives? In the absence of functional llvm-dwarfdump
> frame info the output of -disable-cfi is much friendlier than
> "llvm-readobj -section-data".
>
> OK, so we don't appear to actually do that yet. But I'd be up for
> putting together a few tests.

For new tests I think we should implement something like "readelf
--debug-dump=frames" in llvm-readobj. This was part of removing the
low hanging fruit for dropping support for non-cfi assemblers.

Cheers,
Rafael