[perl #130561] Coredump in Perl_re_op_compile

Before v5.18.0, this'd just die() during a regex compilation. It was either exposed or caused by the following commit:

31c15ce5372b770c3ca899df6cf102f1ed6866ba is the first bad commit
commit 31c15ce5372b770c3ca899df6cf102f1ed6866ba
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sat Sep 15 12:27:22 2012 -0600

    PATCH: [perl #82954] Make "Can't do {n,m} with n > m into warning

    This commit now causes this situation to warn instead of dying.  The
    portion of the regular expression that can't match is optimized into an
    OPFAIL.

• [perl #130561] Coredump in Perl_re_op_compile by Sergey Aleynikov via RT