[wasm] Allow import function to be any kind of callables.

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index fdec11b33fb572aac5fbc42a3145cef376484fd3..430a99228c87815888bedb00292a4006eb277270 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -455,7 +455,7 @@ static MaybeHandle<JSFunction> ReportFFIError(
   return MaybeHandle<JSFunction>();
 }
 
-static MaybeHandle<JSFunction> LookupFunction(
+static MaybeHandle<JSReceiver> LookupFunction(
     ErrorThrower& thrower, Factory* factory, Handle<JSReceiver> ffi,
     uint32_t index, Handle<String> module_name,
     MaybeHandle<String> function_name) {
@@ -493,12 +493,12 @@ static MaybeHandle<JSFunction> LookupFunction(
     function = module;
   }
 
-  if (!function->IsJSFunction()) {
-    return ReportFFIError(thrower, "not a function", index, module_name,
+  if (!function->IsCallable()) {
+    return ReportFFIError(thrower, "not a callable", index, module_name,
                           function_name);
   }
 
-  return Handle<JSFunction>::cast(function);
+  return Handle<JSReceiver>::cast(function);
 }
 
 namespace {
@@ -645,7 +645,7 @@ bool CompileWrappersToImportedFunctions(Isolate* isolate,
       int param_count = sig_data_size - ret_count;
       CHECK(param_count >= 0);
 
-      MaybeHandle<JSFunction> function = LookupFunction(
+      MaybeHandle<JSReceiver> function = LookupFunction(
           *thrower, isolate->factory(), ffi, index, module_name, function_name);
       if (function.is_null()) return false;