Another try at intrinsics

[CodaFi]

Use dynamic member lookup to index into the intrinsic table. Unfortunately, we don't quite have the APIs to do this, so I've had to add a shim library to let us grab the extent and members of the intrinsics table. If we commit to this API, we can upstream these bindings to LLVM and keep moving. It's probably a good idea to have llvmshims for prototyping anyways...

To deal with overloads, provide the non-overloaded name of the selector and any parameter types you need to resolve the thing. Once it's been resolved, you can look up the function by its full name or the intrinsic by its non-overloaded name with Module.intrinsic(named:parameters:).

guard let logf16 = module.intrinsic(Intrinsic.ID.llvm_log, parameters: [ FloatType.half ]) else {
  fatalError("Unknown intrinsic?")
}
_ = builder.buildCall(logf16, args: [half])

[CodaFi]

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