update operator-list function, test=develop (#3003)

lite/core/op_registry.cc

@@ -19,6 +19,10 @@
 namespace paddle {
 namespace lite {
 
+const std::map<std::string, std::string> &GetOp2PathDict() {
+  return OpKernelInfoCollector::Global().GetOp2PathDict();
+}
+
 std::list<std::unique_ptr<KernelBase>> KernelRegistry::Create(
     const std::string &op_type,
     TargetType target,

lite/core/op_registry.h

@@ -72,6 +72,8 @@ class OpKernelInfoCollector {
 namespace paddle {
 namespace lite {
 
+const std::map<std::string, std::string> &GetOp2PathDict();
+
 using KernelFunc = std::function<void()>;
 using KernelFuncCreator = std::function<std::unique_ptr<KernelFunc>()>;
 class LiteOpRegistry final : public Factory<OpLite, std::shared_ptr<OpLite>> {