doc: for llvmcall

[ihnorton]

To get this started anyway.

[ihnorton]

#8919

[ivarne]

Does
``test/llvmcall.jl
https://github.com/JuliaLang/julia/blob/master/test/llvmcall.jl_ work in this context?

[vchuravy]

So the changes for #11604 would be:

• llvmcall accepts as first argument a tuple of form (decl::String, IR::String), where decl can contain a single declaration or multiple.

Also the second argument should be a of form Tuple{Type1, ...}

[jakebolewski]

Bump, it would seem useful to get this in.

[ihnorton]

Rebased.

[tkelman]

Needs to go in helpdb now I think?

[ihnorton]

I believe I have sacrificed the proper number of rare newts to satisfy the docsys god here. Also included other minor changes from running genstdlib.

There was an error about a missing shell script on travis, but I restarted and it seems to have proceeded this time.

[yuyichao]

Mind fixing this to become a proper function entry?

Ref #13622 (comment)

[ihnorton]

I tried, but I've hit my non-deterministic error rate-limit for the day. The system refuses to recognize the function signatures. (yes, I rebuilt Julia, matched the signatures in helpdb and collections.rst, rebuilt julia again, ...).

Also, every 3rd or 4th run of genstdlib I get:

ERROR: LoadError: UnicodeError: invalid character index
 [inlined code] from ./int.jl:187

[ihnorton]

(note that there are several different signatures, and the one in set.jl that takes an unspecified iterable is different from unique(::AbstractArray, dim::Int) definition in multi.jl. I tried a variety of different combinations, including splitting the doc strings up)