Add a `@JSExportName` annotation for internal use in the runtime (use it to export dart.assert inst…

lib/runtime/dart/_utils.js

 dart_library.library('dart/_utils', null, /* Imports */[
 ], /* Lazy imports */[
 ], function(exports, dart) {
   'use strict';
   const defineProperty = Object.defineProperty;
   const getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
   const getOwnPropertyNames = Object.getOwnPropertyNames;
   const getOwnPropertySymbols = Object.getOwnPropertySymbols;
   const hasOwnProperty = Object.prototype.hasOwnProperty;
   const StrongModeError = (function() {
     function StrongModeError(message) {
       Error.call(this);
       this.message = message;
     }
     ;
     Object.setPrototypeOf(StrongModeError.prototype, Error.prototype);
     return StrongModeError;
   })();
   function throwStrongModeError(message) {
     throw new StrongModeError(message);
   }
   function throwInternalError(message) {
     throw Error(message);
   }
-  function assert_(condition) {
+  function assert(condition) {
     if (!condition) throwInternalError("The compiler is broken: failed assert");
   }
   function getOwnNamesAndSymbols(obj) {
     return getOwnPropertyNames(obj).concat(getOwnPropertySymbols(obj));
   }
   function safeGetOwnProperty(obj, name) {
     let desc = getOwnPropertyDescriptor(obj, name);
     if (desc) return desc.value;
   }
   function defineLazyProperty(to, name, desc) {
@@ skipping 52 matching lines @@
   }
   // Exports:
   exports.defineProperty = defineProperty;
   exports.getOwnPropertyDescriptor = getOwnPropertyDescriptor;
   exports.getOwnPropertyNames = getOwnPropertyNames;
   exports.getOwnPropertySymbols = getOwnPropertySymbols;
   exports.hasOwnProperty = hasOwnProperty;
   exports.StrongModeError = StrongModeError;
   exports.throwStrongModeError = throwStrongModeError;
   exports.throwInternalError = throwInternalError;
-  exports.assert_ = assert_;
+  exports.assert = assert;
   exports.getOwnNamesAndSymbols = getOwnNamesAndSymbols;
   exports.safeGetOwnProperty = safeGetOwnProperty;
   exports.defineLazyProperty = defineLazyProperty;
   exports.defineLazy = defineLazy;
   exports.defineMemoizedGetter = defineMemoizedGetter;
   exports.copyTheseProperties = copyTheseProperties;
   exports.copyProperties = copyProperties;
   exports.export_ = export_;
 });