[wasm] Support validation of asm.js modules with != 3 args.

src/runtime/runtime-compiler.cc

Index: src/runtime/runtime-compiler.cc
diff --git a/src/runtime/runtime-compiler.cc b/src/runtime/runtime-compiler.cc
index 862fefcd5045ad3fbc7a5dcd85c2b032be34387a..43faa21315cfe7c02edcae7011f5f65cd55cfead 100644
--- a/src/runtime/runtime-compiler.cc
+++ b/src/runtime/runtime-compiler.cc
@@ -4,6 +4,8 @@
 
 #include "src/runtime/runtime-utils.h"
 
+#include "src/runtime/runtime-compiler.h"
+
 #include "src/arguments.h"
 #include "src/asmjs/asm-js.h"
 #include "src/compiler.h"
@@ -82,18 +84,19 @@ RUNTIME_FUNCTION(Runtime_CompileOptimized_NotConcurrent) {
 
 RUNTIME_FUNCTION(Runtime_InstantiateAsmJs) {
   HandleScope scope(isolate);
-  DCHECK_EQ(args.length(), 4);
+  DCHECK_GE(args.length(), 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
 
   Handle<JSObject> foreign;
-  if (args[2]->IsJSObject()) {
+  if (args.length() > 2 && args[2]->IsJSObject()) {
     foreign = args.at<i::JSObject>(2);
   }
   Handle<JSArrayBuffer> memory;
-  if (args[3]->IsJSArrayBuffer()) {
+  if (args.length() > 3 && args[3]->IsJSArrayBuffer()) {
     memory = args.at<i::JSArrayBuffer>(3);
   }
-  if (args[1]->IsJSObject()) {
+  if (args.length() > 1 && args[1]->IsJSObject() &&
+      function->shared()->HasAsmWasmData()) {
     MaybeHandle<Object> result;
     result = AsmJs::InstantiateAsmWasm(
         isolate, handle(function->shared()->asm_wasm_data()), memory, foreign);