[ignition] Fix more -Wsign-compare warnings.

src/interpreter/bytecode-array-writer.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/interpreter/bytecode-array-writer.h"
 
 #include "src/api.h"
 #include "src/interpreter/bytecode-label.h"
 #include "src/interpreter/bytecode-register.h"
 #include "src/interpreter/constant-array-builder.h"
@@ skipping 255 matching lines @@
       PatchJumpWith32BitOperand(jump_location + prefix_offset, delta);
       break;
     default:
       UNREACHABLE();
   }
   unbound_jumps_--;
 }
 
 void BytecodeArrayWriter::EmitJump(BytecodeNode* node, BytecodeLabel* label) {
   DCHECK(Bytecodes::IsJump(node->bytecode()));
-  DCHECK_EQ(0, node->operand(0));
+  DCHECK_EQ(0u, node->operand(0));
 
   size_t current_offset = bytecodes()->size();
 
   if (label->is_bound()) {
     CHECK_GE(current_offset, label->offset());
     CHECK_LE(current_offset, static_cast<size_t>(kMaxInt));
     // Label has been bound already so this is a backwards jump.
     size_t abs_delta = current_offset - label->offset();
     int delta = -static_cast<int>(abs_delta);
     OperandScale operand_scale = Bytecodes::ScaleForSignedOperand(delta);
@@ skipping 30 matching lines @@
         node->set_bytecode(node->bytecode(), k32BitJumpPlaceholder);
         break;
     }
   }
   EmitBytecode(node);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8