Change default method of disabling JIT

https://wiki.php.net/rfc/jit_config_defaults
Closes GH-12678

Improve jit tests

Closes GH-12425

Fix JIT crash with large number of match/switch arms (#8961)

Switch statements may generate a large number of exit points. Once the max
number of exit points is reached, get_exit_addr()

Fix JIT crash with large number of match/switch arms (#8961)

Switch statements may generate a large number of exit points. Once the max
number of exit points is reached, get_exit_addr() returns NULL. This was not
checked, and this resulted in a jump table with some 0 addresses.

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