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

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1724 matching lines @@
                                  int num_arguments,
                                  SaveFPRegsMode save_doubles) {
   // All arguments must be on the stack before this function is called.
   // x0 holds the return value after the call.
 
   // Check that the number of arguments matches what the function expects.
   // If f->nargs is -1, the function can accept a variable number of arguments.
   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);
   CallStub(&stub);
 }
 
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
   Mov(x0, num_arguments);
@@ skipping 3397 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64