Introduce exception object and remove some uses of MaybeObject::IsFailure().

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/240883003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20871 ce2b1a6d-e550-0410-aec6-3dcde31c8c00