Flesh out dynamic invocation code

test/codegen/expect/dart/convert.js

 var convert;
 (function(exports) {
   'use strict';
   let _processed = Symbol('_processed');
   let _original = Symbol('_original');
   // Function _convertJsonToDart: (dynamic, (dynamic, dynamic) → dynamic) → dynamic
   function _convertJsonToDart(json, reviver) {
     dart.assert(reviver !== null);
     // Function walk: (dynamic) → dynamic
     function walk(e) {
@@ skipping 1171 matching lines @@
           throw new JsonUnsupportedObjectError(object);
         }
         this[_removeSeen](object);
       } catch (e) {
         throw new JsonUnsupportedObjectError(object, {cause: e});
       }
 
     }
     writeJsonValue(object) {
       if (dart.is(object, core.num)) {
-        if (dart.throw_("Unimplemented PrefixExpression: !object.isFinite"))
+        if (dart.dunary('!', dart.dload(object, 'isFinite')))
           return false;
         this.writeNumber(dart.as(object, core.num));
         return true;
       } else if (core.identical(object, true)) {
         this.writeString('true');
         return true;
       } else if (core.identical(object, false)) {
         this.writeString('false');
         return true;
       } else if (object === null) {
@@ skipping 1118 matching lines @@
   exports.ClosableStringSink = ClosableStringSink;
   exports.StringConversionSinkBase = StringConversionSinkBase;
   exports.StringConversionSinkMixin = StringConversionSinkMixin;
   exports.UNICODE_REPLACEMENT_CHARACTER_RUNE = UNICODE_REPLACEMENT_CHARACTER_RUNE;
   exports.UNICODE_BOM_CHARACTER_RUNE = UNICODE_BOM_CHARACTER_RUNE;
   exports.UTF8 = UTF8;
   exports.Utf8Codec = Utf8Codec;
   exports.Utf8Encoder = Utf8Encoder;
   exports.Utf8Decoder = Utf8Decoder;
 })(convert || (convert = {}));