VM: Fix bug in optimization of identical comparisons.
VM: Fix bug in optimization of identical comparisons.

When the propagated type information of a value refers to a generic
type parameter, assume that it can be a number. In that case we can't
eliminate the number check.

TBR=srdjan@google.com

Review URL: https://codereview.chromium.org//29023002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@28856 260f80e4-7a28-3924-810f-c04153c831b5

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