[turbofan] Introduce CheckIf node (deopt without explicit frame state).

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_
 
 #include <iosfwd>
 
 // Opcodes for control operators.
@@ skipping 198 matching lines @@
   V(ChangeInt31ToTaggedSigned)     \
   V(ChangeInt32ToTagged)           \
   V(ChangeUint32ToTagged)          \
   V(ChangeFloat64ToTagged)         \
   V(ChangeTaggedToBit)             \
   V(ChangeBitToTagged)             \
   V(CheckedUint32ToInt32)          \
   V(CheckedFloat64ToInt32)         \
   V(CheckedTaggedToInt32)          \
   V(CheckedTaggedToFloat64)        \
+  V(CheckIf)                       \
   V(TruncateTaggedToWord32)        \
   V(TruncateTaggedToFloat64)       \
   V(Allocate)                      \
   V(LoadField)                     \
   V(LoadBuffer)                    \
   V(LoadElement)                   \
   V(StoreField)                    \
   V(StoreBuffer)                   \
   V(StoreElement)                  \
   V(ObjectIsCallable)              \
@@ skipping 413 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_