[ignition] Fix more -Wsign-compare warnings.

test/unittests/interpreter/bytecode-array-writer-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/api.h"
 #include "src/factory.h"
 #include "src/interpreter/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 86 matching lines @@
 }
 
 void BytecodeArrayWriterUnittest::WriteJumpLoop(Bytecode bytecode,
                                                 BytecodeLabel* label, int depth,
                                                 BytecodeSourceInfo info) {
   BytecodeNode node(bytecode, 0, depth, info);
   writer()->WriteJump(&node, label);
 }
 
 TEST_F(BytecodeArrayWriterUnittest, SimpleExample) {
-  CHECK_EQ(bytecodes()->size(), 0);
+  CHECK_EQ(bytecodes()->size(), 0u);
 
   Write(Bytecode::kStackCheck, {10, false});
-  CHECK_EQ(bytecodes()->size(), 1);
+  CHECK_EQ(bytecodes()->size(), 1u);
 
   Write(Bytecode::kLdaSmi, 127, {55, true});
-  CHECK_EQ(bytecodes()->size(), 3);
+  CHECK_EQ(bytecodes()->size(), 3u);
 
   Write(Bytecode::kLdar, Register(200).ToOperand());
-  CHECK_EQ(bytecodes()->size(), 7);
+  CHECK_EQ(bytecodes()->size(), 7u);
 
   Write(Bytecode::kReturn, {70, true});
-  CHECK_EQ(bytecodes()->size(), 8);
+  CHECK_EQ(bytecodes()->size(), 8u);
 
   static const uint8_t bytes[] = {B(StackCheck), B(LdaSmi), U8(127),  B(Wide),
                                   B(Ldar),       R16(200),  B(Return)};
   CHECK_EQ(bytecodes()->size(), arraysize(bytes));
   for (size_t i = 0; i < arraysize(bytes); ++i) {
     CHECK_EQ(bytecodes()->at(i), bytes[i]);
   }
 
   Handle<BytecodeArray> bytecode_array = writer()->ToBytecodeArray(
       isolate(), 0, 0, factory()->empty_fixed_array());
@@ skipping 95 matching lines @@
     CHECK_EQ(source_iterator.source_position(), expected.source_position);
     CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
     source_iterator.Advance();
   }
   CHECK(source_iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8