libevmasm: refactor asm-json export & add support for source list.

Author: aarlt

libevmasm/Assembly.cpp

@@ -272,6 +272,7 @@ Json::Value Assembly::assemblyJSON(map<string, unsigned> const& _sourceIndices,
 	{
 		root["sourceList"] = Json::arrayValue;
 		Json::Value& jsonSourceList = root["sourceList"];
+		vector<string> sourceNames(_sourceIndices.size());
 		for (auto const& [name, index]: _sourceIndices)
 			jsonSourceList[index] = name;
 	}