[wasm] Disallow runtime calls in asm.js modules.

src/typing-asm.cc

 // Copyright 2015 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 "src/typing-asm.h"
 
 #include <limits>
 
 #include "src/v8.h"
 
@@ skipping 1053 matching lines @@
     }
     IntersectResult(expr, fun_type->Result());
     return;
   }
 
   FAIL(expr, "ill-typed new operator");
 }
 
 
 void AsmTyper::VisitCallRuntime(CallRuntime* expr) {
-  // Allow runtime calls for now.
+  FAIL(expr, "runtime call not allowed");
 }
 
 
 void AsmTyper::VisitUnaryOperation(UnaryOperation* expr) {
   if (!in_function_) {
     FAIL(expr, "unary operator inside module body");
   }
   switch (expr->op()) {
     case Token::NOT:  // Used to encode != and !==
       RECURSE(VisitWithExpectation(expr->expression(), cache_.kAsmInt,
@@ skipping 530 matching lines @@
 }
 
 
 void AsmTyper::VisitRewritableExpression(RewritableExpression* expr) {
   RECURSE(Visit(expr->expression()));
 }
 
 
 }  // namespace internal
 }  // namespace v8