[utils] Use --expand in Demangle::Node lldb type summary (#65897)

Without `--expand`, only the summary is shown, no child nodes. Adding `--expand` allows 
for printing the child nodes, to be printed too.

Follow up to #40568

Author: kastiglione

utils/lldb/lldbSwiftDataFormatters.py

@@ -14,7 +14,7 @@ def __lldb_init_module(debugger, internal_dict):
     tName = 'lldbSwiftDataFormatters.SmallBitVectorSummaryProvider'
     debugger.HandleCommand('type summary add -w llvm '
                            '-F %s -x "^llvm::SmallBitVector$"' % tName)
-    debugger.HandleCommand('type summary add --skip-references -w swift '
+    debugger.HandleCommand('type summary add --expand --skip-references -w swift '
                            '-F lldbSwiftDataFormatters.DemangleNodeSummaryProvider '
                            '-x "^swift::Demangle::Node$"')
     debugger.HandleCommand('type synthetic add --skip-references -w swift '