Remove call-indirections from type tests.

sdk/lib/_internal/compiler/implementation/ssa/codegen.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.
 
 part of ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 2225 matching lines @@
       push(new js.Conditional(
           new js.Binary('==',
               new js.Prefix("typeof", pop()),
               js.string('function')),
           whenFunction,
           whenNotFunction));
     }
 
     js.PropertyAccess field =
         new js.PropertyAccess.field(pop(), backend.namer.operatorIs(element));
-    if (backend.emitter.nativeEmitter.requiresNativeIsCheck(element)) {
-      push(new js.Call(field, <js.Expression>[]));
-      if (negative) push(new js.Prefix('!', pop()));
-    } else {
-      // We always negate at least once so that the result is boolified.
-      push(new js.Prefix('!', field));
-      // If the result is not negated, put another '!' in front.
-      if (!negative) push(new js.Prefix('!', pop()));
-    }
-
+    // We always negate at least once so that the result is boolified.
+    push(new js.Prefix('!', field));
+    // If the result is not negated, put another '!' in front.
+    if (!negative) push(new js.Prefix('!', pop()));
   }
 
   void handleNumberOrStringSupertypeCheck(HInstruction input, DartType type) {
     assert(!identical(type.element, compiler.listClass)
            && !Elements.isListSupertype(type.element, compiler)
            && !Elements.isStringOnlySupertype(type.element, compiler));
     checkNum(input, '===');
     js.Expression numberTest = pop();
     checkString(input, '===');
     js.Expression stringTest = pop();
@@ skipping 694 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }