Add getting strings from string constants

[rj45]

I could not see any way to retrieve the value of a string constant.

I am currently attempting to make an LLVM backend in Go. It's a bit ambitious, we'll see how far I get. I suspect I will need a few more methods added to the Go bindings. I am not sure if you prefer one large PR or several small ones, please let me know.

Thanks for your time, it's much appreciated :-)

[rj45]

Closing this PR as it's on master, and I added another commit... If this PR is wanted, I can open a new one. Let me know.

[aykevl]

Looks interesting!

I am currently attempting to make an LLVM backend in Go. It's a bit ambitious, we'll see how far I get.

Oof, that's going to be difficult! While the LLVM backends are certainly not easy to work on (a lot harder than frontends), they know a ton of little details about intrinsics, special ways to legalize operations, and generally make it much more feasible to write a LLVM backend. Oh, and of course all the knowledge about binary formats like ELF and DWARF.
Not trying to prevent you, just telling you it might be more difficult than you'd expect.

I am not sure if you prefer one large PR or several small ones, please let me know.

Smaller PRs, unless the commits really depend on each other (which is usually not the case for LLVM bindings).

[rj45]

I am currently attempting to make an LLVM backend in Go. It's a bit ambitious, we'll see how far I get.

Oof, that's going to be difficult!

Yeah I know. If I knew C++ it would be a no brainer to write it inside LLVM. But well, I haven't done C++ in two decades at this point. Besides, I really enjoy Go. Having a longer term project has been very enjoyable.

Anyway, I will try to get this in a different branch and resubmit it in the next few days here.