[parser] Ensure asm.js modules always allocate context.

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3428 matching lines @@
       new (zone) i::DeclarationScope(zone, &avf);
   i::Scope* s = i::Scope::DeserializeScopeChain(
       isolate, zone, f->context()->scope_info(), script_scope, &avf,
       i::Scope::DeserializationMode::kIncludingVariables);
   return s;
 }
 
 }  // namespace
 
 TEST(AsmModuleFlag) {
+  i::FLAG_validate_asm = false;
   i::Isolate* isolate = CcTest::i_isolate();
   i::HandleScope scope(isolate);
   LocalContext env;
 
   const char* src =
       "function m() {"
       "  'use asm';"
-      "  var x = 0;"
-      "  function f() { return x };"
+      "  function f() { return 0 };"
       "  return { f:f };"
       "}"
       "m();";
 
   i::Zone zone(isolate->allocator(), ZONE_NAME);
   v8::Local<v8::Value> v = CompileRun(src);
   i::Handle<i::Object> o = v8::Utils::OpenHandle(*v);
   i::Handle<i::JSObject> m = i::Handle<i::JSObject>::cast(o);
 
   // The asm.js module should be marked as such.
@@ skipping 5089 matching lines @@
     DCHECK_NOT_NULL(scope);
     DCHECK_NULL(scope->sibling());
     DCHECK(scope->is_function_scope());
     const i::AstRawString* var_name =
         info.ast_value_factory()->GetOneByteString("my_var");
     i::Variable* var = scope->Lookup(var_name);
     CHECK_EQ(inners[i].ctxt_allocate,
              i::ScopeTestHelper::MustAllocateInContext(var));
   }
 }