[turbofan] First shot at eager deoptimization in Turbofan.

src/compiler/opcodes.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_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 // Opcodes for control operators.
 #define INNER_CONTROL_OP_LIST(V) \
   V(Dead)                        \
   V(Loop)                        \
   V(Branch)                      \
   V(IfTrue)                      \
   V(IfFalse)                     \
   V(IfSuccess)                   \
   V(IfException)                 \
   V(Switch)                      \
   V(IfValue)                     \
   V(IfDefault)                   \
   V(Merge)                       \
+  V(Deoptimize)                  \
   V(Return)                      \
   V(OsrNormalEntry)              \
   V(OsrLoopEntry)                \
   V(Throw)
 
 #define CONTROL_OP_LIST(V) \
   INNER_CONTROL_OP_LIST(V) \
   V(Start)                 \
   V(End)
 
@@ skipping 290 matching lines @@
            (kNumberEqual <= value && value <= kStringLessThanOrEqual) ||
            (kWord32Equal <= value && value <= kFloat64LessThanOrEqual);
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_