Description:
------------
When pcre.jit=1 everything is ok
With pcre.jit=0 we encounter slowness



From valgrind / kcachegrind results,
99% spent in php_pcre_math_impl (in pcre_exec for 7.2 or php_pcre2_match for 7.3)

Test script:
---------------
<?php
printf("PHP version %s\n", PHP_VERSION);
printf("pcre.jit=%d\n", ini_get('pcre.jit'));
$fd = __DIR__.'/data';
$a = str_repeat("\n", 1000000);
file_put_contents($fd, $a);
$fi = finfo_open(FILEINFO_NONE);
$t = microtime(true);
var_dump(finfo_file($fi, $fd));
printf("Time = %.4f\n", microtime(true) - $t);
finfo_close($fi);


Expected result:
----------------
PHP version 7.1.24RC1
pcre.jit=1
string(10) "ASCII text"
Time = 0.0147


Actual result:
--------------
PHP version 7.2.12RC1
pcre.jit=1
string(10) "ASCII text"
Time = 0,0172

PHP version 7.2.12RC1
pcre.jit=0
string(10) "ASCII text"
Time = 0,6555

40 times slower


PHP version 7.3.0RC4
pcre.jit=1
string(10) "ASCII text"
Time = 0.0177

PHP version 7.3.0RC4
pcre.jit=0
string(10) "ASCII text"
Time = 2.2364

126 times slower