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

test/cctest/wasm/test-run-wasm-module.cc

Index: test/cctest/wasm/test-run-wasm-module.cc
diff --git a/test/cctest/wasm/test-run-wasm-module.cc b/test/cctest/wasm/test-run-wasm-module.cc
index 94054bd388024480074867b660b3074154c03452..1bcbbcd1194659d660ef74de44342ff8bffa4dcd 100644
--- a/test/cctest/wasm/test-run-wasm-module.cc
+++ b/test/cctest/wasm/test-run-wasm-module.cc
@@ -536,7 +536,7 @@ TEST(TestInterruptLoop) {
     HandleScope scope(isolate);
     testing::SetupIsolateForWasmModule(isolate);
     ErrorThrower thrower(isolate, "Test");
-    const Handle<JSObject> instance =
+    const Handle<WasmInstanceObject> instance =
         testing::CompileInstantiateWasmModuleForTesting(
             isolate, &thrower, buffer.begin(), buffer.end(),
             ModuleOrigin::kWasmOrigin);