Add back ascii fast path for toupper/tolower
Add back ascii fast path for toupper/tolower

R=yangguo@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/11889007
Patch from Dan Carney <dcarney@google.com>.

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@13376 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh