[perl #79152] super-linear cache can prevent a valid match

[perl #79152] super-linear cache can prevent a valid match

The super-linear cache in regexec.c can prevent a valid match
from being detected. For example:

print "yay\n" if 'xayxay' =~ /(q1|.)*(q2|.)*(x(a|bc)*y){2,}/;

This should match, but it doesn't because the cache fails to
distinguish between matching the final xay to x(a|bc)*y as the
first instance of the {2,} and matching it in the same position
as the second instance.

This seems to do the trick.