Revert of Separate Scope into DeclarationScope and Scope

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index c07c286608834df62d5cb8eca3fe5d8e69d126ee..702e0f92f6d7b6041800a8b0f661b6491b0f056c 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -211,8 +211,7 @@
     int num_parameters = info->scope()->num_parameters();
     int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
     for (int i = first_parameter; i < num_parameters; i++) {
-      Variable* var =
-          (i == -1) ? info->scope()->receiver() : info->scope()->parameter(i);
+      Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
       if (var->IsContextSlot()) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
                                  (num_parameters - 1 - i) * kPointerSize;
@@ -244,7 +243,7 @@
 
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
-  Variable* this_function_var = info->scope()->this_function_var();
+  Variable* this_function_var = scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
     if (!function_in_register_a1) {
@@ -254,7 +253,7 @@
     SetVar(this_function_var, a1, a0, a2);
   }
 
-  Variable* new_target_var = info->scope()->new_target_var();
+  Variable* new_target_var = scope()->new_target_var();
   if (new_target_var != nullptr) {
     Comment cmnt(masm_, "[ new.target");
     SetVar(new_target_var, a3, a0, a2);
@@ -262,7 +261,7 @@
 
   // Possibly allocate RestParameters
   int rest_index;
-  Variable* rest_param = info->scope()->rest_parameter(&rest_index);
+  Variable* rest_param = scope()->rest_parameter(&rest_index);
   if (rest_param) {
     Comment cmnt(masm_, "[ Allocate rest parameter array");
     if (!function_in_register_a1) {
@@ -274,7 +273,7 @@
     SetVar(rest_param, v0, a1, a2);
   }
 
-  Variable* arguments = info->scope()->arguments();
+  Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
@@ -3635,7 +3634,7 @@
 
 
 void FullCodeGenerator::PushFunctionArgumentForContextAllocation() {
-  DeclarationScope* closure_scope = scope()->GetClosureScope();
+  Scope* closure_scope = scope()->ClosureScope();
   if (closure_scope->is_script_scope() ||
       closure_scope->is_module_scope()) {
     // Contexts nested in the native context have a canonical empty function