core: Add ArrayLikeValue

For exposing LLVM values that can be accessed like an array.

nac3core/src/codegen/irrt/mod.rs

@@ -687,8 +687,7 @@ fn call_ndarray_flatten_index_impl<'ctx, G, Indices>(
 ) -> IntValue<'ctx>
     where
         G: CodeGenerator + ?Sized,
-        Indices: ArrayLikeIndexer<'ctx>,
+        Indices: ArrayLikeIndexer<'ctx>, {
-{
     let llvm_i32 = ctx.ctx.i32_type();
     let llvm_usize = generator.get_size_type(ctx.ctx);