Revert "Add initial support for inlining."

src/compiler/js-inlining.h

-// 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.
-
-#ifndef V8_COMPILER_JS_INLINING_H_
-#define V8_COMPILER_JS_INLINING_H_
-
-#include "src/compiler/js-graph.h"
-#include "src/v8.h"
-
-namespace v8 {
-namespace internal {
-namespace compiler {
-
-class JSInliner {
- public:
-  JSInliner(CompilationInfo* info, JSGraph* jsgraph)
-      : info_(info), jsgraph_(jsgraph) {}
-
-  void Inline();
-  void TryInlineCall(Node* node);
-
- private:
-  friend class InlinerVisitor;
-  CompilationInfo* info_;
-  JSGraph* jsgraph_;
-
-  static void UnifyReturn(Graph* graph);
-};
-}
-}
-}  // namespace v8::internal::compiler
-
-#endif  // V8_COMPILER_JS_INLINING_H_