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performance regression for Unicode properties #930

Description

@carenas

Since 7c215fa (released with PCRE2 10.45), the compilation performance for any regular expression that refers to UCP properties took a deep dive as shown by:

$ ./pcre2test -t
PCRE2 version 10.44 2024-06-07 (8-bit)
  re> /[\p{Nd}<>]+/
Compile time   1.0432 microseconds
data> <1>
Match time  0.1026 microseconds
 0: <1>

PCRE2 version 10.48-DEV 2025-10-21 (8-bit)
  re> /[\p{Nd}<>]+/
Compile time   2.4452 microseconds
data> <1>
Match time  0.0951 microseconds
 0: <1>

a perf of the process shows that more than 70% of the CPU time is spent updating the classbits (_pcre2_update_classbits_8).

Note that there is also a similar degradation in regex that use UTF characters directly (from 53 to 126) for the query in testinput4:

/[^ABCDEFGHIJKLMNOPQRSTUVWXYZÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞĀĂĄĆĈĊČĎĐĒĔĖĘĚĜĞĠĢĤĦĨĪĬĮİIJĴĶĹĻĽĿŁŃŅŇŊŌŎŐŒŔŖŘŚŜŞŠŢŤŦŨŪŬŮŰŲŴŶŸŹŻŽƁƂƄƆƇƉƊƋƎƏƐƑƓƔƖƗƘƜƝƟƠƢƤƦƧƩƬƮƯƱƲƳƵƷƸƼDŽLJNJǍǏǑǓǕǗǙǛǞǠǢǤǦǨǪǬǮDZǴǶǷǸǺǼǾȀȂȄȆȈȊȌȎȐȒȔȖȘȚȜȞȠȢȤȦȨȪȬȮȰ
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