[ignition] Fix -Wsign-compare warnings.

test/unittests/interpreter/bytecode-array-iterator-unittest.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/v8.h"
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "test/unittests/test-utils.h"
 
@@ skipping 17 matching lines @@
   Handle<HeapObject> heap_num_1 = factory->NewHeapNumber(2147483647);
   Smi* zero = Smi::kZero;
   Smi* smi_0 = Smi::FromInt(64);
   Smi* smi_1 = Smi::FromInt(-65536);
   Register reg_0(0);
   Register reg_1(1);
   RegisterList pair(0, 2);
   RegisterList triple(0, 3);
   Register param = Register::FromParameterIndex(2, builder.parameter_count());
   Handle<String> name = factory->NewStringFromStaticChars("abc");
-  int name_index = 2;
-  int feedback_slot = 97;
+  uint32_t name_index = 2;
+  uint32_t feedback_slot = 97;
 
   builder.LoadLiteral(heap_num_0)
       .StoreAccumulatorInRegister(reg_0)
       .LoadLiteral(heap_num_1)
       .StoreAccumulatorInRegister(reg_0)
       .LoadLiteral(zero)
       .StoreAccumulatorInRegister(reg_0)
       .LoadLiteral(smi_0)
       .StackCheck(0)
       .StoreAccumulatorInRegister(reg_0)
@@ skipping 228 matching lines @@
   CHECK_EQ(iterator.current_offset(), offset);
   CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
   CHECK(!iterator.done());
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8