dart2js: Improve code quality after min/max changes

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

Index: sdk/lib/_internal/js_runtime/lib/math_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/math_patch.dart b/sdk/lib/_internal/js_runtime/lib/math_patch.dart
index b37ba521b3e5b812409db9007d4274f04a33a1fa..c774c20a02b892825be9ec1613e1086fca65e60e 100644
--- a/sdk/lib/_internal/js_runtime/lib/math_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/math_patch.dart
@@ -8,12 +8,18 @@ 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));