dart2js: Improve code quality after min/max changes

sdk/lib/_internal/js_runtime/lib/math_patch.dart

 // Copyright (c) 2012, 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.
 
 // Patch file for dart:math library.
 import 'dart:_foreign_helper' show JS;
 import 'dart:_js_helper' show patch, checkNum;
 import 'dart:typed_data' show ByteData;
 
 @patch
-T min<T extends num>(T a, T b) =>
-    JS('num', r'Math.min(#, #)', checkNum(a), checkNum(b)) as T;
+T min<T extends num>(T a, T b) => JS(
+    'returns:num;depends:none;effects:none;gvn:true',
+    r'Math.min(#, #)',
+    checkNum(a),
+    checkNum(b));
 
 @patch
-T max<T extends num>(T a, T b) =>
-    JS('num', r'Math.max(#, #)', checkNum(a), checkNum(b)) as T;
+T max<T extends num>(T a, T b) => JS(
+    'returns:num;depends:none;effects:none;gvn:true',
+    r'Math.max(#, #)',
+    checkNum(a),
+    checkNum(b));
 
 @patch
 double sqrt(num x) => JS('num', r'Math.sqrt(#)', checkNum(x));
 
 @patch
 double sin(num radians) => JS('num', r'Math.sin(#)', checkNum(radians));
 
 @patch
 double cos(num radians) => JS('num', r'Math.cos(#)', checkNum(radians));
 
@@ skipping 291 matching lines @@
       // last range of k*max .. 256**byteCount.
       // TODO: Consider picking a higher byte count if the last range is a
       // significant portion of the entire range - a 50% chance of having
       // to use two more bytes is no worse than always using one more.
       if (random - result + max < randomLimit) {
         return result;
       }
     }
   }
 }