[llvm] r212443 - CodeGen: it turns out that NAND is not the same thing as BIC. At all.

[Tim Northover]

> Yep. I remember investigating this back when we first added this stuff for
> ARM and having a few *facepalm* moments. Pretty sure we do the same thing
> there. I agree switching the behavior to match gcc 4.4+ is the right thing
> to do. We should make sure 32-bit ARM does the same thing.

That came automatically with the first commit. The code is shared by
ARM and AArch64.

Cheers.

Tim.