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

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 83c7ce891758b9ca68091d18dad3dd3404dc70da..5a8473266cfdd187195e4a25145a1b182ce47930 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2180,7 +2180,9 @@ void MacroAssembler::CallRuntime(const Runtime::Function* f,
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
-  Move(eax, Immediate(num_arguments));
+  if (num_arguments >= 0) {
+    Move(eax, Immediate(num_arguments));
+  }
   mov(ebx, Immediate(ExternalReference(f, isolate())));
   CEntryStub ces(isolate(), 1, save_doubles);
   CallStub(&ces);