Remove more vestigial CONST_LEGACY support and clean up var declaration code

src/runtime/runtime-scopes.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include <memory>
 
 #include "src/accessors.h"
 #include "src/arguments.h"
@@ skipping 191 matching lines @@
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
   CONVERT_LANGUAGE_MODE_ARG_CHECKED(language_mode, 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
 
   Handle<JSGlobalObject> global(isolate->global_object());
   RETURN_RESULT_OR_FAILURE(
       isolate, Object::SetProperty(global, name, value, language_mode));
 }
 
-
-RUNTIME_FUNCTION(Runtime_InitializeConstGlobal) {
-  HandleScope handle_scope(isolate);
-  DCHECK_EQ(2, args.length());
-  CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
-
-  Handle<JSGlobalObject> global(isolate->global_object());
-
-  // Lookup the property as own on the global object.
-  LookupIterator it(global, name, global, LookupIterator::OWN_SKIP_INTERCEPTOR);
-  Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
-  DCHECK(maybe.IsJust());
-  PropertyAttributes old_attributes = maybe.FromJust();
-
-  PropertyAttributes attr =
-      static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
-  // Set the value if the property is either missing, or the property attributes
-  // allow setting the value without invoking an accessor.
-  if (it.IsFound()) {
-    // Ignore if we can't reconfigure the value.
-    if ((old_attributes & DONT_DELETE) != 0) {
-      if ((old_attributes & READ_ONLY) != 0 ||
-          it.state() == LookupIterator::ACCESSOR) {
-        return *value;
-      }
-      attr = static_cast<PropertyAttributes>(old_attributes | READ_ONLY);
-    }
-  }
-
-  RETURN_FAILURE_ON_EXCEPTION(
-      isolate, JSObject::DefineOwnPropertyIgnoreAttributes(&it, value, attr));
-
-  return *value;
-}
-
 namespace {
 
 Object* DeclareEvalHelper(Isolate* isolate, Handle<String> name,
                           Handle<Object> value) {
   // Declarations are always made in a function, native, or script context, or
   // a declaration block scope. Since this is called from eval, the context
   // passed is the context of the caller, which may be some nested context and
   // not the declaration context.
   Handle<Context> context_arg(isolate->context(), isolate);
   Handle<Context> context(context_arg->declaration_context(), isolate);
@@ skipping 711 matching lines @@
 RUNTIME_FUNCTION(Runtime_StoreLookupSlot_Strict) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
   RETURN_RESULT_OR_FAILURE(isolate, StoreLookupSlot(name, value, STRICT));
 }
 
 }  // namespace internal
 }  // namespace v8