Fix KeyedAccessStoreMode on Windows

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/13812011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14189 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Let ComputeTarget fail if it skips over NORMAL objects.

BUG=v8:2595

Review URL: https://chromiumcodereview.appspot.com/13862008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14190 ce2b1a6d-e550-0410-aec6-3dcde31c8c00