Refactoring: Remove a redundant map from model.h.

Cherry picking this into TFLite r0.1.7 release for a compatibility issue.
The original Piper ID: 194306629

Author: miaout17

tensorflow/contrib/lite/kernels/test_util.h

@@ -88,7 +88,9 @@ struct TensorData {
 class SingleOpResolver : public OpResolver {
  public:
   SingleOpResolver(const BuiltinOperator op, TfLiteRegistration* registration)
-      : op_(op), registration_(registration) {}
+      : op_(op), registration_(registration) {
+    registration_->builtin_code = op;
+  }
   TfLiteRegistration* FindOp(BuiltinOperator op) const override {
     if (op == op_) {
       return registration_;

tensorflow/contrib/lite/model.cc

@@ -191,7 +191,6 @@ TfLiteStatus InterpreterBuilder::BuildLocalIndexToRegistrationMapping() {
           builtin_code);
       status = kTfLiteError;
     } else if (builtin_code != BuiltinOperator_CUSTOM) {
-      flatbuffer_op_index_to_registration_types_.push_back(builtin_code);
       registration = op_resolver_.FindOp(builtin_code);
       if (registration == nullptr) {
         error_reporter_->Report("Didn't find op for builtin opcode '%s'\n",
@@ -205,8 +204,6 @@ TfLiteStatus InterpreterBuilder::BuildLocalIndexToRegistrationMapping() {
     } else {
       const char* name = opcode->custom_code()->c_str();
       registration = op_resolver_.FindOp(name);
-      flatbuffer_op_index_to_registration_types_.push_back(
-          BuiltinOperator_CUSTOM);
       if (registration == nullptr) {
         error_reporter_->Report("Didn't find custom op for name '%s'\n", name);
         status = kTfLiteError;
@@ -685,8 +682,7 @@ TfLiteStatus InterpreterBuilder::ParseNodes(
       continue;
     }
 
-    auto op_type =
-        flatbuffer_op_index_to_registration_types_[op->opcode_index()];
+    BuiltinOperator op_type = static_cast<BuiltinOperator>(reg->builtin_code);
     if (op_type != BuiltinOperator_CUSTOM && op->custom_options()) {
       error_reporter_->Report(
           "Found builtin operator %s with custom options.\n",

tensorflow/contrib/lite/model.h

@@ -188,7 +188,6 @@ class InterpreterBuilder {
   ErrorReporter* error_reporter_;
 
   std::vector<TfLiteRegistration*> flatbuffer_op_index_to_registration_;
-  std::vector<BuiltinOperator> flatbuffer_op_index_to_registration_types_;
   const Allocation* allocation_ = nullptr;
 };