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

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index f674dd53e785e0d34db3f7f7c9cba8fda9f607ef..e17bdad9519b4bcec5e871cce658290acc6f0a1d 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -1742,7 +1742,9 @@ void MacroAssembler::CallRuntime(const Runtime::Function* f,
   CHECK(f->nargs < 0 || f->nargs == num_arguments);
 
   // Place the necessary arguments.
-  Mov(x0, num_arguments);
+  if (num_arguments >= 0) {
+    Mov(x0, num_arguments);
+  }
   Mov(x1, ExternalReference(f, isolate()));
 
   CEntryStub stub(isolate(), 1, save_doubles);