Refactor debug library to use object:🧝:* (#1860)

* Add GDB test

* rm stray test resource

* use object:🧝:* structures

* install gdb on CI

.github/actions/define-llvm-env/action.yml

@@ -1,5 +1,5 @@
 name: 'Set up a DWARFDUMP env'
-description: 'Set up a DWARFDUMP env (see tests/debug/dump.rs)'
+description: 'Set up a DWARFDUMP env (see tests/all/debug/dump.rs)'
 
 runs:
   using: node12

.github/workflows/main.yml

@@ -225,7 +225,9 @@ jobs:
         RUST_BACKTRACE: 1
 
     # Test debug (DWARF) related functionality.
-    - run: cargo test test_debug_dwarf -- --ignored --test-threads 1
+    - run: |
+        sudo apt-get install -y gdb
+        cargo test test_debug_dwarf -- --ignored --test-threads 1
       if: matrix.os == 'ubuntu-latest'
       env:
         RUST_BACKTRACE: 1