Reland of [ignition/turbo] Perform liveness analysis on the bytecodes

src/interpreter/bytecode-label.h

 // 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_INTERPRETER_BYTECODE_LABEL_H_
 #define V8_INTERPRETER_BYTECODE_LABEL_H_
 
 #include "src/zone/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 class BytecodeArrayBuilder;
 
 // A label representing a branch target in a bytecode array. When a
 // label is bound, it represents a known position in the bytecode
 // array. For labels that are forward references there can be at most
 // one reference whilst it is unbound.
-class BytecodeLabel final {
+class V8_EXPORT_PRIVATE BytecodeLabel final {
  public:
   BytecodeLabel() : bound_(false), offset_(kInvalidOffset) {}
 
   bool is_bound() const { return bound_; }
   size_t offset() const { return offset_; }
 
  private:
   static const size_t kInvalidOffset = static_cast<size_t>(-1);
 
   void bind_to(size_t offset) {
@@ skipping 16 matching lines @@
   //  UNSET             false    kInvalidOffset
   //  FORWARD_TARGET    false    Offset of referring jump
   //  BACKWARD_TARGET    true    Offset of label in bytecode array when bound
   bool bound_;
   size_t offset_;
 
   friend class BytecodeArrayWriter;
 };
 
 // Class representing a branch target of multiple jumps.
-class BytecodeLabels {
+class V8_EXPORT_PRIVATE BytecodeLabels {
  public:
   explicit BytecodeLabels(Zone* zone) : labels_(zone) {}
 
   BytecodeLabel* New();
 
   void Bind(BytecodeArrayBuilder* builder);
 
   void BindToLabel(BytecodeArrayBuilder* builder, const BytecodeLabel& target);
 
   bool is_bound() const {
@@ skipping 10 matching lines @@
   ZoneVector<BytecodeLabel> labels_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeLabels);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_LABEL_H_