[llvm] r250349 - [MachO] Stop generating *coal* sections.

[Rafael Espíndola via llvm-commits]

> If the target is powerpc, we continue to use the *coal* sections since anyone
> targeting powerpc is probably using an old linker that doesn't have support for
> the weak-def bits.

Iain, is that still the case?

I remember some talk about requiring newer builds of cctools when
targeting powerpc.

Cheers,
Rafael