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

src/compiler/code-generator-impl.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_CODE_GENERATOR_IMPL_H_
 #define V8_COMPILER_CODE_GENERATOR_IMPL_H_
 
 #include "src/code-stubs.h"
 #include "src/compiler/code-generator.h"
 #include "src/compiler/instruction.h"
@@ skipping 110 matching lines @@
 
   ExternalReference ToExternalReference(InstructionOperand* op) {
     return ToConstant(op).ToExternalReference();
   }
 
   Handle<HeapObject> ToHeapObject(InstructionOperand* op) {
     return ToConstant(op).ToHeapObject();
   }
 
   Frame* frame() const { return gen_->frame(); }
+  FrameAccessState* frame_access_state() const {
+    return gen_->frame_access_state();
+  }
   Isolate* isolate() const { return gen_->isolate(); }
   Linkage* linkage() const { return gen_->linkage(); }
 
  protected:
   CodeGenerator* gen_;
   Instruction* instr_;
 };
 
 
 // Generator for out-of-line code that is emitted after the main code is done.
@@ skipping 28 matching lines @@
 #elif V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
   masm->ud2();
 #endif
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_IMPL_H