Add comment to mock-compiler.

Add comment to mock-compiler.

Sample backtrace:
#0      Object.noSuchMethod (dart:core-patch:600:3)
#1      PartialTypeTree.newNode (file:///dart/lib/compiler/implementation/universe/partial_type_tree.dart:47:52)
#2      PartialTypeTree.findNode (file:///dart/lib/compiler/implementation/universe/partial_type_tree.dart:76:21)
#3      SelectorMap.[]= (file:///dart/lib/compiler/implementation/universe/selector_map.dart:25:39)
#4      ArgumentTypesRegistry.registerDynamicInvocation (file:///dart/lib/compiler/implementation/js_backend/backend.dart:520:22)
#5      JavaScriptBackend.registerDynamicInvocation (file:////dart/lib/compiler/implementation/js_backend/backend.dart:774:44)
#6      SsaCodeGenerator.visitInvokeClosure (file:///dart/lib/compiler/implementation/ssa/codegen.dart:1556:38)
#7      HInvokeClosure.accept (file:///dart/lib/compiler/implementation/ssa/nodes.dart:1323:57)

Committed: https://code.google.com/p/dart/source/detail?r=13892

[ahe, 2012-10-18 16:42:30]

Thanks for the explanation!

LGTM

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
File tests/compiler/dart2js/mock_compiler.dart (right):

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
tests/compiler/dart2js/mock_compiler.dart:100: // dynamic invocation the
ArgumentTypesRegistry eventually iterates over
In that case, the ArgumentTypesRegistry registry should really make sure that
objectClass is resolved.

[floitsch, 2012-10-18 17:16:49]

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
File tests/compiler/dart2js/mock_compiler.dart (right):

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
tests/compiler/dart2js/mock_compiler.dart:100: // dynamic invocation the
ArgumentTypesRegistry eventually iterates over
On 2012/10/18 16:42:30, ahe wrote:
> In that case, the ArgumentTypesRegistry registry should really make sure that
> objectClass is resolved.
Should I file a bug?

[ahe, 2012-10-22 16:50:08]

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
File tests/compiler/dart2js/mock_compiler.dart (right):

https://codereview.chromium.org/11184042/diff/1/tests/compiler/dart2js/mock_c...
tests/compiler/dart2js/mock_compiler.dart:100: // dynamic invocation the
ArgumentTypesRegistry eventually iterates over
On 2012/10/18 17:16:50, floitsch wrote:
> On 2012/10/18 16:42:30, ahe wrote:
> > In that case, the ArgumentTypesRegistry registry should really make sure
that
> > objectClass is resolved.
> Should I file a bug?

Yes, that would be great!