[turbofan] Add the CheckedTruncateTaggedToWord32 opcode.

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 174 matching lines @@
   V(CheckedInt32Add)                  \
   V(CheckedInt32Sub)                  \
   V(CheckedInt32Div)                  \
   V(CheckedInt32Mod)                  \
   V(CheckedUint32Div)                 \
   V(CheckedUint32Mod)                 \
   V(CheckedInt32Mul)                  \
   V(CheckedUint32ToInt32)             \
   V(CheckedFloat64ToInt32)            \
   V(CheckedTaggedToInt32)             \
+  V(CheckedTruncateTaggedToWord32)    \
   V(CheckedTaggedToFloat64)
 
 #define SIMPLIFIED_COMPARE_BINOP_LIST(V) \
   V(NumberEqual)                         \
   V(NumberLessThan)                      \
   V(NumberLessThanOrEqual)               \
   V(ReferenceEqual)                      \
   V(StringEqual)                         \
   V(StringLessThan)                      \
   V(StringLessThanOrEqual)
@@ skipping 527 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_