Test basic DWARF generation (#931)

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

tests/debug/obj.rs

@@ -0,0 +1,34 @@
+use anyhow::{Context as _, Result};
+use std::fs::File;
+use std::path::Path;
+use target_lexicon::Triple;
+use wasmtime::Strategy;
+use wasmtime_cli::compile_to_obj;
+use wasmtime_environ::CacheConfig;
+
+pub fn compile_cranelift(
+    wasm: &[u8],
+    target: Option<Triple>,
+    output: impl AsRef<Path>,
+) -> Result<()> {
+    let obj = compile_to_obj(
+        wasm,
+        target.as_ref(),
+        Strategy::Cranelift,
+        false,
+        false,
+        true,
+        output
+            .as_ref()
+            .file_name()
+            .unwrap()
+            .to_string_lossy()
+            .to_string(),
+        &CacheConfig::new_cache_disabled(),
+    )?;
+
+    let file = File::create(output).context("failed to create object file")?;
+    obj.write(file).context("failed to write object file")?;
+
+    Ok(())
+}