Remove the symbol table entry too when removing a global state/function/var.

lslopt/lsldeadcode.py

@@ -489,6 +489,9 @@ class deadcode(object):
                 delete = self.SymbolReplacedOrDeleted(node)
 
             if delete:
+                if node['nt'] in ('DECL', 'STDEF', 'FNDEF'):
+                    # Delete the symbol table entry too
+                    del self.symtab[0][node['name']]
                 del self.tree[idx]
                 del LocMap[idx]
             else: