[wasm] Add the 0x prefix to all constants in PrintAstForDebugging

src/wasm/ast-decoder.cc

 // 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.
 
 #include "src/signature.h"
 
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
 #include "src/zone/zone-containers.h"
@@ skipping 1949 matching lines @@
           std::make_tuple(i.pc_offset(), line_nr, num_whitespaces));
     }
 
     // 64 whitespaces
     const char* padding =
         "                                                                ";
     os.write(padding, num_whitespaces);
     os << "k" << WasmOpcodes::OpcodeName(opcode) << ",";
 
     for (size_t j = 1; j < length; ++j) {
-      os << " " << AsHex(i.pc()[j], 2) << ",";
+      os << " 0x" << AsHex(i.pc()[j], 2) << ",";
     }
 
     switch (opcode) {
       case kExprElse:
         os << "   // @" << i.pc_offset();
         control_depth++;
         break;
       case kExprLoop:
       case kExprIf:
       case kExprBlock:
@@ skipping 54 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   FunctionBody body = {nullptr, nullptr, nullptr, start, end};
   WasmFullDecoder decoder(zone, nullptr, body);
   return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8