Documentation for LLVM r247378

Hi David,

While updating GHC's LLVM code generator for LLVM's master branch I
noticed that our aliases were broken. I ultimately traced this back to
r247378 which you authored. This commit appears to change syntax yet
does not update the language reference. Is this just an oversight or
have I misunderstood something?

Cheers,

- Ben

Looks like I updated it in r250967, sorry it wasn’t in the same commit