[wasm][asm.js] Require exported asm.js functions have be names.

src/asmjs/asm-typer.cc

 // Copyright 2016 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/asmjs/asm-typer.h"
 
 #include <algorithm>
 #include <limits>
 #include <memory>
 #include <string>
@@ skipping 917 matching lines @@
   }
 
   if (auto* obj_export = exports->expression()->AsObjectLiteral()) {
     // Exporting object literal.
     for (auto* prop : *obj_export->properties()) {
       if (!prop->key()->IsLiteral()) {
         FAIL(prop->key(),
              "Only normal object properties may be used in the export object "
              "literal.");
       }
+      if (!prop->key()->AsLiteral()->IsPropertyName()) {
+        FAIL(prop->key(),
+             "Exported functions must have valid identifier names.");
+      }
 
       auto* export_obj = prop->value()->AsVariableProxy();
       if (export_obj == nullptr) {
         FAIL(prop->value(), "Exported value must be an asm.js function name.");
       }
 
       RECURSE(ExportType(export_obj));
     }
 
     return AsmType::Int();
@@ skipping 1927 matching lines @@
     return true;
   }
 
   *error_message = typer.error_message();
   return false;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8