Fix bug in the inliner when dealing with named optional parameters.

tests/language/named_parameters_with_conversions_test.dart

 // Copyright (c) 2011, 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.
 //
 // Test named arguments work as expected regardless of whether the function or
 // method is called via function call syntax or method call syntax.
+// VMOptions=--optimization-counter-threshold=10
 
 import "package:expect/expect.dart";
 
 
 Validate(tag, a, b) {
   // tag encodes which parameters are passed in with values a: 111, b: 222.
   if (tag == 'ab') {
     Expect.equals(a, 111);
     Expect.equals(b, 222);
   }
@@ skipping 75 matching lines @@
     a.foo('ab', 111, 222);
     a.foo2('a', a: 111);
     a.foo2('b', b: 222);
     a.foo2('ab', a: 111, b: 222);
     a.foo2('ab', b: 222, a: 111);
 
     Expect.equals(7, a.calls);
 
     checkException(() => a.foo());                 // Too few arguments.
     checkException(() => a.foo('abc', 1, 2, 3));   // Too many arguments.
-    checkException(() => a.foo2('c', c: 1));        // Bad name.
+    checkException(() => a.foo2('c', c: 1));       // Bad name.
+    checkException(() => a.foo2('c', a:111, c: 1));  // Bad name.
 
     Expect.equals(7, a.calls);
   }
 
   static testFunctionCallSyntax(a) {
     var f = a.foo;
     var f2 = a.foo2;
     f('');
     f('a', 111);
     f('ab', 111, 222);
     f2('a', a: 111);
     f2('b', b: 222);
     f2('ab', a: 111, b: 222);
     f2('ab', b: 222, a: 111);
 
     Expect.equals(7, a.calls);
 
     checkException(() => f());                 // Too few arguments.
     checkException(() => f('abc', 1, 2, 3));   // Too many arguments.
-    checkException(() => f2('c', c: 1));        // Bad name.
+    checkException(() => f2('c', c: 1));       // Bad name.
+    checkException(() => f2('c', a: 111, c: 1));  // Bad name.
 
     Expect.equals(7, a.calls);
   }
 
   static testMain() {
     // 'Plain' calls where the method/field syntax matches the object.
     testMethodCallSyntax(new HasMethod());
     testFunctionCallSyntax(new HasField());
 
     // 'Conversion' calls where method/field call syntax does not match the
     // object.
     testMethodCallSyntax(new HasField());
     testFunctionCallSyntax(new HasMethod());
   }
 }
 
 main() {
-  NamedParametersWithConversionsTest.testMain();
+  for (var i = 0; i < 20; i++) {
+    NamedParametersWithConversionsTest.testMain();
+  }
 }