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

[Tim Northover]

> I do not often modify the docs, so please feel free to critique harshly. ;)

I'm not sure about using "negate". That can mean "-x" as well, and
someone might think that's being contrasted with NOT. Particularly as
the order in both phrases is the same.

Perhaps spell out the operations in C syntax to avoid any ambiguity?
"... Atomic NAND(x, y) as "x & ~y" ... updated to ~(x & y)"?

Cheers.

Tim.