[ignition] Fix more -Wsign-compare warnings.

test/unittests/interpreter/bytecode-pipeline-unittest.cc

 // Copyright 2016 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/v8.h"
 
 #include "src/interpreter/bytecode-pipeline.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/isolate.h"
 #include "test/unittests/test-utils.h"
@@ skipping 141 matching lines @@
   uint32_t operands[] = {0x71, 0xa5, 0x5a, 0xfc};
   BytecodeSourceInfo source_info(77, false);
   BytecodeNode node(Bytecode::kForInNext, operands[0], operands[1], operands[2],
                     operands[3], source_info);
 
   BytecodeNode clone(Bytecode::kIllegal);
   clone = node;
   clone.set_bytecode(Bytecode::kJump, 0x01aabbcc);
   CHECK_EQ(clone.bytecode(), Bytecode::kJump);
   CHECK_EQ(clone.operand_count(), 1);
-  CHECK_EQ(clone.operand(0), 0x01aabbcc);
+  CHECK_EQ(clone.operand(0), 0x01aabbccu);
   CHECK_EQ(clone.source_info(), source_info);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8