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

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 5576 matching lines @@
 
   // If the expected number of arguments of the runtime function is
   // constant, we check that the actual number of arguments match the
   // expectation.
   CHECK(f->nargs < 0 || f->nargs == num_arguments);
 
   // TODO(1236192): Most runtime routines don't need the number of
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
-  PrepareCEntryArgs(num_arguments);
+  if (num_arguments >= 0) {
+    PrepareCEntryArgs(num_arguments);
+  }
   PrepareCEntryFunction(ExternalReference(f, isolate()));
   CEntryStub stub(isolate(), 1, save_doubles);
   CallStub(&stub, TypeFeedbackId::None(), al, zero_reg, Operand(zero_reg), bd);
 }
 
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments,
                                            BranchDelaySlot bd) {
   PrepareCEntryArgs(num_arguments);
@@ skipping 1301 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS