Fix bug in register allocation at catch entry blocks.
Fix bug in register allocation at catch entry blocks.

The registers used to pass the exception and the stacktrace values
need to be blocked at catch block entry until after the CatchEntry
instruction which stores them into local variables.

R=vegorov@google.com

Review URL: https://codereview.chromium.org//17232004

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@24105 260f80e4-7a28-3924-810f-c04153c831b5

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