[turbofan] Introduce PlainPrimitiveToNumber.

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 157 matching lines @@
   V(NumberEqual)                         \
   V(NumberLessThan)                      \
   V(NumberLessThanOrEqual)               \
   V(ReferenceEqual)                      \
   V(StringEqual)                         \
   V(StringLessThan)                      \
   V(StringLessThanOrEqual)
 
 #define SIMPLIFIED_OP_LIST(V)      \
   SIMPLIFIED_COMPARE_BINOP_LIST(V) \
+  V(PlainPrimitiveToNumber)        \
+  V(PlainPrimitiveToWord32)        \
+  V(PlainPrimitiveToFloat64)       \
   V(BooleanNot)                    \
   V(BooleanToNumber)               \
   V(SpeculativeNumberAdd)          \
   V(SpeculativeNumberSubtract)     \
   V(NumberAdd)                     \
   V(NumberSubtract)                \
   V(NumberMultiply)                \
   V(NumberDivide)                  \
   V(NumberModulus)                 \
   V(NumberBitwiseOr)               \
@@ skipping 456 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_