[wasm] Use more precise types for some WASM objects.

test/common/wasm/wasm-module-runner.h

 // 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.
 
 #ifndef V8_WASM_MODULE_RUNNER_H_
 #define V8_WASM_MODULE_RUNNER_H_
 
 #include "src/handles.h"
 #include "src/isolate.h"
 #include "src/objects.h"
 #include "src/wasm/wasm-interpreter.h"
 #include "src/wasm/wasm-module.h"
+#include "src/wasm/wasm-objects.h"
 #include "src/wasm/wasm-result.h"
 #include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 namespace testing {
 
 // Decodes the given encoded module.
 const WasmModule* DecodeWasmModuleForTesting(
     Isolate* isolate, ErrorThrower* thrower, const byte* module_start,
     const byte* module_end, ModuleOrigin origin, bool verify_functions = false);
 
 // Instantiates a module without any imports and exports.
-const Handle<JSObject> InstantiateModuleForTesting(Isolate* isolate,
-                                                   ErrorThrower* thrower,
-                                                   const WasmModule* module);
+const Handle<WasmInstanceObject> InstantiateModuleForTesting(
+    Isolate* isolate, ErrorThrower* thrower, const WasmModule* module);
 
 int32_t CallWasmFunctionForTesting(Isolate* isolate, Handle<JSObject> instance,
                                    ErrorThrower* thrower, const char* name,
                                    int argc, Handle<Object> argv[],
                                    ModuleOrigin origin);
 
 // Decode, verify, and run the function labeled "main" in the
 // given encoded module. The module should have no imports.
 int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,
                                 const byte* module_end, ModuleOrigin origin);
 
 // Interprets the given module, starting at the function specified by
 // {function_index}. The return type of the function has to be int32. The module
 // should not have any imports or exports
 int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
                             const WasmModule* module, int function_index,
                             WasmVal* args, bool* may_produced_nan);
 
 // Compiles WasmModule bytes and return an instance of the compiled module.
-const Handle<JSObject> CompileInstantiateWasmModuleForTesting(
+const Handle<WasmInstanceObject> CompileInstantiateWasmModuleForTesting(
     Isolate* isolate, ErrorThrower* thrower, const byte* module_start,
     const byte* module_end, ModuleOrigin origin);
 
 // Runs the module instance with arguments.
 int32_t RunWasmModuleForTesting(Isolate* isolate, Handle<JSObject> instance,
                                 int argc, Handle<Object> argv[],
                                 ModuleOrigin origin);
 // Install function map, module symbol for testing
 void SetupIsolateForWasmModule(Isolate* isolate);
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_RUNNER_H_