Test basic DWARF generation (#931)

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

tests/debug/dump.rs

@@ -0,0 +1,30 @@
+use anyhow::{bail, Result};
+use std::env;
+use std::process::Command;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[allow(dead_code)]
+pub enum DwarfDumpSection {
+    DebugInfo,
+    DebugLine,
+}
+
+pub fn get_dwarfdump(obj: &str, section: DwarfDumpSection) -> Result<String> {
+    let dwarfdump = env::var("DWARFDUMP").unwrap_or("llvm-dwarfdump".to_string());
+    let section_flag = match section {
+        DwarfDumpSection::DebugInfo => "-debug-info",
+        DwarfDumpSection::DebugLine => "-debug-line",
+    };
+    let output = Command::new(&dwarfdump)
+        .args(&[section_flag, obj])
+        .output()
+        .expect("success");
+    if !output.status.success() {
+        bail!(
+            "failed to execute {}: {}",
+            dwarfdump,
+            String::from_utf8_lossy(&output.stderr),
+        );
+    }
+    Ok(String::from_utf8_lossy(&output.stdout).to_string())
+}