Some cleanups.

src/bin/ngrc.rs

@@ -6,7 +6,7 @@ use codespan_reporting::term::termcolor::{ColorChoice, StandardStream};
 use cranelift_object::object;
 
 use ngr::backend::BackendError;
-use ngr::backend::Program as Cranelift;
+use ngr::backend::Backend;
 use ngr::ir::Program as IR;
 use ngr::syntax::{ParserError, Program as Syntax};
 use target_lexicon::Triple;
@@ -70,8 +70,9 @@ fn compile(file_database: &mut SimpleFiles<String, String>) -> Result<(), MainEr
     }
 
     let ir = IR::from(syntax.simplify());
-    let compiled = Cranelift::new(Triple::host(), ir)?;
-    let bytes = compiled.bytes()?;
+    let mut backend = Backend::object_file(Triple::host())?;
+    backend.compile_function("gogogo", ir)?; 
+    let bytes = backend.bytes()?;
     std::fs::write(args.output.unwrap_or_else(|| "output.o".to_string()), bytes)?;
     Ok(())
 }