[turbofan] Add support for eager/soft deoptimization reasons.

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index 76bc09b6164ab835c527991117642281a2cb2d9b..b839acf6a66f3301baa252c34c7bce69b58128e8 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -1161,9 +1161,23 @@ class FrameStateDescriptor : public ZoneObject {
   FrameStateDescriptor* outer_state_;
 };
 
+// A deoptimization entry is a pair of the reason why we deoptimize and the
+// frame state descriptor that we have to go back to.
+class DeoptimizationEntry final {
+ public:
+  DeoptimizationEntry() {}
+  DeoptimizationEntry(FrameStateDescriptor* descriptor, DeoptimizeReason reason)
+      : descriptor_(descriptor), reason_(reason) {}
+
+  FrameStateDescriptor* descriptor() const { return descriptor_; }
+  DeoptimizeReason reason() const { return reason_; }
 
-typedef ZoneVector<FrameStateDescriptor*> DeoptimizationVector;
+ private:
+  FrameStateDescriptor* descriptor_ = nullptr;
+  DeoptimizeReason reason_ = DeoptimizeReason::kNoReason;
+};
 
+typedef ZoneVector<DeoptimizationEntry> DeoptimizationVector;
 
 class PhiInstruction final : public ZoneObject {
  public:
@@ -1414,21 +1428,11 @@ class InstructionSequence final : public ZoneObject {
     return Constant(static_cast<int32_t>(0));
   }
 
-  class StateId {
-   public:
-    static StateId FromInt(int id) { return StateId(id); }
-    int ToInt() const { return id_; }
-
-   private:
-    explicit StateId(int id) : id_(id) {}
-    int id_;
-  };
-
-  StateId AddFrameStateDescriptor(FrameStateDescriptor* descriptor);
-  FrameStateDescriptor* GetFrameStateDescriptor(StateId deoptimization_id);
-  int GetFrameStateDescriptorCount();
-  DeoptimizationVector const& frame_state_descriptors() const {
-    return deoptimization_entries_;
+  int AddDeoptimizationEntry(FrameStateDescriptor* descriptor,
+                             DeoptimizeReason reason);
+  DeoptimizationEntry const& GetDeoptimizationEntry(int deoptimization_id);
+  int GetDeoptimizationEntryCount() const {
+    return static_cast<int>(deoptimization_entries_.size());
   }
 
   RpoNumber InputRpo(Instruction* instr, size_t index);