[turbofan] Add initial support for SOFT deopts.

src/compiler/common-operator.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_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/compiler/frame-states.h"
 #include "src/machine-type.h"
 #include "src/zone-containers.h"
@@ skipping 33 matching lines @@
   return hint;
 }
 
 inline size_t hash_value(BranchHint hint) { return static_cast<size_t>(hint); }
 
 std::ostream& operator<<(std::ostream&, BranchHint);
 
 BranchHint BranchHintOf(const Operator* const);
 
 
+// Deoptimize bailout kind.
+enum class DeoptimizeKind : uint8_t { kEager, kSoft };
+
+size_t hash_value(DeoptimizeKind kind);
+
+std::ostream& operator<<(std::ostream&, DeoptimizeKind);
+
+DeoptimizeKind DeoptimizeKindOf(const Operator* const);
+
+
 // Prediction whether throw-site is surrounded by any local catch-scope.
 enum class IfExceptionHint { kLocallyUncaught, kLocallyCaught };
 
 size_t hash_value(IfExceptionHint hint);
 
 std::ostream& operator<<(std::ostream&, IfExceptionHint);
 
 
 class SelectParameters final {
  public:
@@ skipping 53 matching lines @@
   const Operator* End(size_t control_input_count);
   const Operator* Branch(BranchHint = BranchHint::kNone);
   const Operator* IfTrue();
   const Operator* IfFalse();
   const Operator* IfSuccess();
   const Operator* IfException(IfExceptionHint hint);
   const Operator* Switch(size_t control_output_count);
   const Operator* IfValue(int32_t value);
   const Operator* IfDefault();
   const Operator* Throw();
-  const Operator* Deoptimize();
+  const Operator* Deoptimize(DeoptimizeKind kind);
   const Operator* Return(int value_input_count = 1);
   const Operator* Terminate();
 
   const Operator* Start(int value_output_count);
   const Operator* Loop(int control_input_count);
   const Operator* Merge(int control_input_count);
   const Operator* Parameter(int index, const char* debug_name = nullptr);
 
   const Operator* OsrNormalEntry();
   const Operator* OsrLoopEntry();
@@ skipping 41 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_