Fix bug in MegamorphicCacheMissHandler: put kNullCid into the cache when receiver is null.
Fix bug in MegamorphicCacheMissHandler: put kNullCid into the cache when receiver is null.

We were putting kObjectCid before causing inline lookup code to always miss when receiver is null.

BUG=dart:9815

Review URL: https://codereview.chromium.org//13951007

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@21366 260f80e4-7a28-3924-810f-c04153c831b5

dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk