[turbofan] Reland "Add new JSFrameSpecialization reducer." and "Perform OSR deconstruction early an…

src/compiler/js-frame-specialization.h

Index: src/compiler/js-frame-specialization.h
diff --git a/src/compiler/js-frame-specialization.h b/src/compiler/js-frame-specialization.h
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+++ b/src/compiler/js-frame-specialization.h
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+// 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.
+
+#ifndef V8_COMPILER_JS_FRAME_SPECIALIZATION_H_
+#define V8_COMPILER_JS_FRAME_SPECIALIZATION_H_
+
+#include "src/compiler/graph-reducer.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// Forward declarations.
+class JSGraph;
+
+
+class JSFrameSpecialization final : public Reducer {
+ public:
+  JSFrameSpecialization(JavaScriptFrame const* frame, JSGraph* jsgraph)
+      : frame_(frame), jsgraph_(jsgraph) {}
+  ~JSFrameSpecialization() final {}
+
+  Reduction Reduce(Node* node) final;
+
+ private:
+  Reduction ReduceOsrValue(Node* node);
+  Reduction ReduceParameter(Node* node);
+
+  Isolate* isolate() const;
+  JavaScriptFrame const* frame() const { return frame_; }
+  JSGraph* jsgraph() const { return jsgraph_; }
+
+  JavaScriptFrame const* const frame_;
+  JSGraph* const jsgraph_;
+
+  DISALLOW_COPY_AND_ASSIGN(JSFrameSpecialization);
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_JS_FRAME_SPECIALIZATION_H_