[turbofan] store block id with instruction

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index 70338858a583df27ac546c83e1f1636ab16ba062..25de80c55329d1b8ff4bb24f6bb8023d73f56bda 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -857,6 +857,12 @@ class Instruction final {
   ParallelMove* const* parallel_moves() const { return &parallel_moves_[0]; }
   ParallelMove** parallel_moves() { return &parallel_moves_[0]; }
 
+  int block_id() const { return block_id_; }
+  void set_block_id(int id) {
+    DCHECK(id >= 0);
+    block_id_ = id;
+  }
+
   void Print(const RegisterConfiguration* config) const;
   void Print() const;
 
@@ -877,6 +883,7 @@ class Instruction final {
   uint32_t bit_field_;
   ParallelMove* parallel_moves_[2];
   ReferenceMap* reference_map_;
+  int block_id_;
   InstructionOperand operands_[1];
 
   DISALLOW_COPY_AND_ASSIGN(Instruction);
@@ -1303,6 +1310,8 @@ class InstructionSequence final : public ZoneObject {
   void StartBlock(RpoNumber rpo);
   void EndBlock(RpoNumber rpo);
 
+  void FinishInstructionMap();
+
   int AddConstant(int virtual_register, Constant constant) {
     // TODO(titzer): allow RPO numbers as constants?
     DCHECK(constant.type() != Constant::kRpoNumber);
@@ -1394,7 +1403,6 @@ class InstructionSequence final : public ZoneObject {
   Zone* const zone_;
   InstructionBlocks* const instruction_blocks_;
   SourcePositionMap source_positions_;
-  IntVector block_starts_;
   ConstantMap constants_;
   Immediates immediates_;
   InstructionDeque instructions_;