[WIP] NumberToString operator in TF.

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 208 matching lines @@
   V(NumberBitwiseOr)                    \
   V(NumberBitwiseXor)                   \
   V(NumberBitwiseAnd)                   \
   V(NumberShiftLeft)                    \
   V(NumberShiftRight)                   \
   V(NumberShiftRightLogical)            \
   V(NumberAtan2)                        \
   V(NumberImul)                         \
   V(NumberMax)                          \
   V(NumberMin)                          \
-  V(NumberPow)
+  V(NumberPow)                          \
+  V(NumberToString)
 
 #define SIMPLIFIED_SPECULATIVE_NUMBER_BINOP_LIST(V) \
   V(SpeculativeNumberAdd)                           \
   V(SpeculativeNumberSubtract)                      \
   V(SpeculativeNumberMultiply)                      \
   V(SpeculativeNumberDivide)                        \
   V(SpeculativeNumberModulus)                       \
   V(SpeculativeNumberBitwiseAnd)                    \
   V(SpeculativeNumberBitwiseOr)                     \
   V(SpeculativeNumberBitwiseXor)                    \
@@ skipping 517 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_