scripts: Include all entries in collect_dwarf_info

Note this only affects the top-level entries. Dwarf-info contains a
heirarchical structure, but for some scripts we just don't care. Finding
DW_TAG_variables in nested DW_TAG_lexical_blocks for example.

This is useful for ongoing stack.py rework.

scripts/code.py

@@ -450,10 +450,8 @@ def collect_dwarf_info(obj_path, tags=None, *,
                     off=int(m.group('off'), 16),
                     tag=m.group('tag').strip(),
                 )
-                # keep track of top-level entries
-                if (entry.level == 1 and (
-                        # unless this entry is filtered
-                        tags is None or entry.tag in tags)):
+                # keep track of unfiltered entries
+                if tags is None or entry.tag in tags:
                     info[entry.off] = entry
                 # store entry in parent
                 levels[entry.level] = entry