Method append_block

crates/rustc_codegen_spirv/src/builder/builder_methods.rs:743–750

FIXME(eddyb) change `Self::Function` to be more like a function index.

(
        cx: &'a Self::CodegenCx,
        llfn: Self::Function,
        _name: &str,
    )

    // FIXME(eddyb) change `Self::Function` to be more like a function index.
    fn append_block(
        cx: &'a Self::CodegenCx,
        llfn: Self::Function,
        _name: &str,
    ) -> Self::BasicBlock {
        let cursor_fn = cx.builder.select_function_by_id(llfn.def_cx(cx));
        cx.emit_with_cursor(cursor_fn).begin_block(None).unwrap()
    }

    fn append_sibling_block(&mut self, _name: &str) -> Self::BasicBlock {
        self.emit_with_cursor(BuilderCursor {