sdk files reorganization to make dart2js a proper package

sdk/lib/_internal/js_runtime/lib/native_typed_data.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Specialized integers and floating point numbers,
  * with SIMD support and efficient lists.
  */
 library dart.typed_data.implementation;
 
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   Float64x2 max(Float64x2 other) {
     return new NativeFloat64x2._doubles(x > other.x ? x : other.x,
                                         y > other.y ? y : other.y);
   }
 
   /// Returns the lane-wise square root of [this].
   Float64x2 sqrt() {
       return new NativeFloat64x2._doubles(Math.sqrt(x), Math.sqrt(y));
   }
 }