more care around generated names, fixes #60 #82 and #97

lib/runtime/dart/typed_data.js

 var typed_data;
 (function(exports) {
   'use strict';
   class ByteBuffer extends core.Object {
   }
   class TypedData extends core.Object {
   }
   let _littleEndian = Symbol('_littleEndian');
   class Endianness extends core.Object {
-    Endianness$_($_littleEndian) {
-      this[_littleEndian] = $_littleEndian;
+    Endianness$_(littleEndian) {
+      this[_littleEndian] = littleEndian;
     }
   }
   dart.defineNamedConstructor(Endianness, '_');
   Endianness.BIG_ENDIAN = new Endianness._(false);
   Endianness.LITTLE_ENDIAN = new Endianness._(true);
   dart.defineLazyProperties(Endianness, {
     get HOST_ENDIAN() {
       return new ByteData.view(new Uint16List.fromList(dart.as(new List.from([1]), core.List$(core.int))).buffer).getInt8(0) === 1 ? Endianness.LITTLE_ENDIAN : Endianness.BIG_ENDIAN;
     }
   });
@@ skipping 841 matching lines @@
   exports.Uint64List = Uint64List;
   exports.Float32List = Float32List;
   exports.Float64List = Float64List;
   exports.Float32x4List = Float32x4List;
   exports.Int32x4List = Int32x4List;
   exports.Float64x2List = Float64x2List;
   exports.Float32x4 = Float32x4;
   exports.Int32x4 = Int32x4;
   exports.Float64x2 = Float64x2;
 })(typed_data || (typed_data = {}));