[wasm] Fix -Wsign-compare warnings.

src/wasm/wasm-module.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 <memory>
 
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
 
 #include "src/macro-assembler.h"
@@ skipping 1452 matching lines @@
           }
           WasmIndirectFunctionTable& table =
               module_->function_tables[num_imported_tables];
           TableInstance& table_instance = table_instances_[num_imported_tables];
           table_instance.table_object = Handle<JSObject>::cast(value);
           table_instance.js_wrappers = WasmJs::GetWasmTableFunctions(
               isolate_, table_instance.table_object);
 
           // TODO(titzer): import table size must match exactly for now.
           int table_size = table_instance.js_wrappers->length();
-          if (table_size != table.min_size) {
+          if (table_size != static_cast<int>(table.min_size)) {
             thrower_->TypeError(
                 "table import %d is wrong size (%d), expected %u", index,
                 table_size, table.min_size);
             return -1;
           }
 
           // Allocate a new dispatch table.
           table_instance.dispatch_table =
               isolate_->factory()->NewFixedArray(table_size * 2);
           for (int i = 0; i < table_size * 2; ++i) {
@@ skipping 766 matching lines @@
     CHECK_NOT_NULL(result.val);
     module = const_cast<WasmModule*>(result.val);
   }
 
   Handle<WasmModuleWrapper> module_wrapper =
       WasmModuleWrapper::New(isolate, module);
 
   compiled_module->set_module_wrapper(module_wrapper);
   DCHECK(WasmCompiledModule::IsWasmCompiledModule(*compiled_module));
 }