Reviewed by Richard.

    Reviewed by Richard.

	<rdar://problem/3885076> Don't make IDN calls for all-ascii URLs to save about 3 pages
	at Safari startup.

        * Misc.subproj/WebNSURLExtras.m:
        (mapHostNames): If encoding and not decoding, then bail early if the URL is all ascii.
        (-[NSString _web_mapHostNameWithRange:encode:makeString:]): Remove earlier special-case
	check for localhost, no longer needed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8032 268f45cc-cd09-0410-ab3c-d52691b4dbfc