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

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index a08673d4620243d1e4c598e787f1517b0a629dd5..129c253a93c9d03e7b191334dbb6f1d81b33110d 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2836,7 +2836,9 @@ 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.
-  mov(r0, Operand(num_arguments));
+  if (num_arguments >= 0) {
+    mov(r0, Operand(num_arguments));
+  }
   mov(r1, Operand(ExternalReference(f, isolate())));
   CEntryStub stub(isolate(), 1, save_doubles);
   CallStub(&stub);