[wasm] Fix wasm decoder tracing for prefix opcodes.

src/wasm/wasm-opcodes.h

 // Copyright 2015 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_WASM_OPCODES_H_
 #define V8_WASM_OPCODES_H_
 
 #include "src/machine-type.h"
 #include "src/signature.h"
 
@@ skipping 471 matching lines @@
   kTrapCount
 #undef DECLARE_ENUM
 };
 
 // A collection of opcode-related static methods.
 class WasmOpcodes {
  public:
   static const char* OpcodeName(WasmOpcode opcode);
   static const char* ShortOpcodeName(WasmOpcode opcode);
   static FunctionSig* Signature(WasmOpcode opcode);
+  static bool IsPrefixOpcode(WasmOpcode opcode);
 
   static int TrapReasonToMessageId(TrapReason reason);
   static const char* TrapReasonMessage(TrapReason reason);
 
   static byte MemSize(MachineType type) {
     return 1 << ElementSizeLog2Of(type.representation());
   }
 
   static LocalTypeCode LocalTypeCodeFor(LocalType type) {
     switch (type) {
@@ skipping 132 matching lines @@
       default:
         return "<unknown>";
     }
   }
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OPCODES_H_