Test basic DWARF generation (#931)

* Add obj generation with debug info
* Add simple transform check

src/lib.rs

@@ -25,12 +25,15 @@
 )]
 
 pub mod commands;
+mod obj;
 
 use anyhow::{bail, Result};
 use std::path::PathBuf;
 use structopt::StructOpt;
 use wasmtime::{Config, Strategy};
 
+pub use obj::compile_to_obj;
+
 fn pick_compilation_strategy(cranelift: bool, lightbeam: bool) -> Result<Strategy> {
     Ok(match (lightbeam, cranelift) {
         (true, false) => Strategy::Lightbeam,