Mark tokens as non-reusable in states where shorter takes take precedence

This fixes some randomized test failures in the C grammar, relating to Object-like macros.
The object-like macro rule relies on a whitespace token in order to distinguish object-like
macros whose values begin with a '(' from function-like macros. The presence of that
whitespace token means that other nodes should not be reusable in that state.

src/compiler/build_tables/lex_conflict_manager.cc

@@ -16,6 +16,9 @@ bool LexConflictManager::resolve(const LexItemSet &item_set,
     }
     return true;
   } else {
+    for (const LexItem &item : item_set.entries) {
+      possible_homonyms[item.lhs.index].insert(old_action.symbol.index);
+    }
     return false;
   }
 }