[turbofan] Add general support for sp-based frame access

src/compiler/frame-access-state.cc

Index: src/compiler/frame-access-state.cc
diff --git a/src/compiler/frame-access-state.cc b/src/compiler/frame-access-state.cc
new file mode 100644
index 0000000000000000000000000000000000000000..60684095cffc031904cc8371e348e5793b92d6e7
--- /dev/null
+++ b/src/compiler/frame-access-state.cc
@@ -0,0 +1,21 @@
+// Copyright 2015 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/compiler/frame-access-state.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+void FrameAccessState::UseDefaultFrameAccess() {
+  if (frame()->needs_frame() && !FLAG_turbo_sp_frame_access) {
+    UseFPToAccessFrame();
+  } else {
+    UseSPToAccessFrame();
+  }
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8