Using (*UTF8) control verb results in “Pattern too large” errors with relatively short repeat counts
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Description
Hyperscan supports significantly large bounded repeats on plain patterns, but patterns using UTF8 mode appear to be significantly restricted:
```
$ ./bin/hscheck -e patterns
OK: 1:/x.{32000}/
FAIL (compile): 2:/(*UTF8)x.{73}/: Pattern is too large.
SUMMARY: 1 of 2 failed.
```
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