[turbofan] First shot at eager deoptimization in Turbofan.

src/compiler/common-operator.h

 // Copyright 2013 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/machine-type.h"
 #include "src/unique.h"
 
@@ skipping 160 matching lines @@
   const Operator* End();
   const Operator* Branch(BranchHint = BranchHint::kNone);
   const Operator* IfTrue();
   const Operator* IfFalse();
   const Operator* IfSuccess();
   const Operator* IfException();
   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* Return();
 
   const Operator* Start(int num_formal_parameters);
   const Operator* Loop(int control_input_count);
   const Operator* Merge(int control_input_count);
   const Operator* Parameter(int index);
 
   const Operator* OsrNormalEntry();
   const Operator* OsrLoopEntry();
   const Operator* OsrValue(int index);
@@ skipping 31 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_