Flesh out dynamic invocation code

test/codegen/expect/dart/core.js

 var core;
 (function(exports) {
   'use strict';
   // Function _symbolToString: (Symbol) → String
   function _symbolToString(symbol) {
     return _internal.Symbol.getName(dart.as(symbol, _internal.Symbol));
   }
   // Function _symbolMapToStringMap: (Map<Symbol, dynamic>) → dynamic
   function _symbolMapToStringMap(map) {
     if (map === null)
@@ skipping 418 matching lines @@
           return `0000${n}`;
         return `00000${n}`;
       }
       // Function twoDigits: (int) → String
       function twoDigits(n) {
         if (dart.notNull(n) >= 10)
           return `${n}`;
         return `0${n}`;
       }
       if (dart.notNull(this.inMicroseconds) < 0) {
-        return `-${dart.throw_("Unimplemented PrefixExpression: -this")}`;
+        return `-${this['unary-']()}`;
       }
       let twoDigitMinutes = twoDigits(this.inMinutes.remainder(MINUTES_PER_HOUR));
       let twoDigitSeconds = twoDigits(this.inSeconds.remainder(SECONDS_PER_MINUTE));
       let sixDigitUs = sixDigits(this.inMicroseconds.remainder(MICROSECONDS_PER_SECOND));
       return `${this.inHours}:${twoDigitMinutes}:${twoDigitSeconds}.${sixDigitUs}`;
     }
     get isNegative() {
       return dart.notNull(this[_duration]) < 0;
     }
     abs() {
@@ skipping 1856 matching lines @@
       if (query !== null)
         return _normalize(query, start, end, dart.as(_queryCharTable, List$(int)));
       let result = new StringBuffer();
       let first = true;
       queryParameters.forEach(((key, value) => {
         if (!dart.notNull(first)) {
           result.write("&");
         }
         first = false;
         result.write(Uri.encodeQueryComponent(dart.as(key, String)));
-        if (dart.notNull(value !== null) && dart.notNull(dart.throw_("Unimplemented PrefixExpression: !value.isEmpty"))) {
+        if (dart.notNull(value !== null) && dart.notNull(dart.dunary('!', dart.dload(value, 'isEmpty')))) {
           result.write("=");
           result.write(Uri.encodeQueryComponent(dart.as(value, String)));
         }
       }).bind(this));
       return result.toString();
     }
     static [_makeFragment](fragment, start, end) {
       if (fragment === null)
         return null;
       return _normalize(fragment, start, end, dart.as(_queryCharTable, List$(int)));
@@ skipping 704 matching lines @@
   exports.Stopwatch = Stopwatch;
   exports.String = String;
   exports.Runes = Runes;
   exports.RuneIterator = RuneIterator;
   exports.StringBuffer = StringBuffer;
   exports.StringSink = StringSink;
   exports.Symbol = Symbol;
   exports.Type = Type;
   exports.Uri = Uri;
 })(core || (core = {}));