Cleanup bit casting methods between SIMD types

sdk/lib/typed_data/dart2js/typed_data_dart2js.dart

Index: sdk/lib/typed_data/dart2js/typed_data_dart2js.dart
diff --git a/sdk/lib/typed_data/dart2js/typed_data_dart2js.dart b/sdk/lib/typed_data/dart2js/typed_data_dart2js.dart
index f04e9183c02299fe947cd6db5d6b569bd12c780e..c6d34c3f8d0ff8061277e358d3aca4175454916b 100644
--- a/sdk/lib/typed_data/dart2js/typed_data_dart2js.dart
+++ b/sdk/lib/typed_data/dart2js/typed_data_dart2js.dart
@@ -811,6 +811,14 @@ class Float32x4 {
     _storage[3] = v;
   }
   Float32x4.zero();
+  /// Returns a bit-wise copy of [x] as a Float32x4.
+  Float32x4.fromUint32x4Bits(Uint32x4 x) {
+    var view = new Float32List.view(x._storage.buffer);
+    _storage[0] = view[0];
+    _storage[1] = view[1];
+    _storage[2] = view[2];
+    _storage[3] = view[3];
+  }
 
    /// Addition operator.
   Float32x4 operator+(Float32x4 other) {
@@ -1399,12 +1407,6 @@ class Float32x4 {
     double _w = Math.sqrt(1.0 / _storage[3]);
     return new Float32x4(_x, _y, _z, _w);
   }
-
-  /// Returns a bit-wise copy of [this] as a [Uint32x4].
-  Uint32x4 toUint32x4() {
-    var view = new Uint32List.view(_storage.buffer);
-    return new Uint32x4(view[0], view[1], view[2], view[3]);
-  }
 }
 
 
@@ -1425,6 +1427,15 @@ class Uint32x4 {
     _storage[3] = w == true ? 0xFFFFFFFF : 0x0;
   }
 
+  /// Returns a bit-wise copy of [x] as a Uint32x4.
+  Uint32x4.fromFloat32x4Bits(Float32x4 x) {
+    var view = new Uint32List.view(x._storage.buffer);
+    _storage[0] = view[0];
+    _storage[1] = view[1];
+    _storage[2] = view[2];
+    _storage[3] = view[3];
+  }
+
   /// The bit-wise or operator.
   Uint32x4 operator|(Uint32x4 other) {
     int _x = _storage[0] | other._storage[0];
@@ -1599,10 +1610,4 @@ class Uint32x4 {
     rView[3] = _w;
     return r;
   }
-
-  /// Returns a bit-wise copy of [this] as a [Float32x4].
-  Float32x4 toFloat32x4() {
-    var view = new Float32List.view(_storage.buffer);
-    return new Float32x4(view[0], view[1], view[2], view[3]);
-  }
 }