Add the arity to calls, and support noSuchMethodException.

frog/tests/leg/src/mock_compiler.dart

Index: frog/tests/leg/src/mock_compiler.dart
===================================================================
--- frog/tests/leg/src/mock_compiler.dart	(revision 3496)
+++ frog/tests/leg/src/mock_compiler.dart	(working copy)
@@ -21,7 +21,7 @@
 final String DEFAULT_CORELIB = @'''
   lt() {} add(var a, var b) {} sub() {} mul() {} div() {} tdiv() {} mod() {}
   neg() {} shl() {} shr() {} eq() {} le() {} gt() {} ge() {}
-  or() {} and() {} not() {} print(var obj) {} eqNull() {} eqq() {}
+  or() {} and() {} not() {} print(var obj) {} eqNull(a) {} eqq() {}
   guard$array(x) { return x; }
   guard$num(x) { return x; }
   guard$string(x) { return x; }