commit 34b39fc9cd81fbff0d52451a5c4570293817ca32
Author: Karl Williamson <public@khwilliamson.com>
Date:   Thu Aug 9 14:38:03 2012 -0600

    regcomp.c: Set flags when optimizing a [char class]
    
    A bracketed character class containing a single Latin1-range character
    has long been optimized into an EXACT node.  Also, flags are set to
    include SIMPLE.  However, EXACT nodes containing code points that are
    different when encoded under UTF-8 versus not UTF-8 should not be marked
    simple.
    
    To fix this, the address of the flags parameter is now passed to
    regclass(), the function that parses bracketed character classes, which
    now sets it appropriately.  The unconditional setting of SIMPLE that was
    always done in the code after calling regclass() has been removed.
    
    In addition, the setting of the flags for EXACT nodes has been pushed
    into the common function that populates them.
    
    regclass() will also now increment the naughtiness count if optimized to
    a node that normally does that.  I do not understand this heuristic
    behavior very well, and could not come up with a test case for it;
    experimentation revealed that there are no test cases in our test suite
    for which naughtiness makes any difference at all.