Bug report

Since version 2.1.19 , registering signals via pcntl_signal appears to be treating the provided callback as being executed immediately. In the case mentioned in the code snippet, where the callback calls exit, this triggers a deadCode.unreachable error for the line below - although the code actually continues to be executed.
This behavior starts with level 4.

phpstan analyze --level 4 ./pcntl.php
 1/1 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%

 ------ -------------------------------------------------------
  Line   pcntl.php
 ------ -------------------------------------------------------
  9      Unreachable statement - code above always terminates.
         🪪  deadCode.unreachable
 ------ -------------------------------------------------------



 [ERROR] Found 1 error

Code snippet that reproduces the problem

https://phpstan.org/r/1e3bf5cc-97ec-4cb4-95af-82626bb7e217

Expected output

phpstan analyze --level 4 ./pcntl.php
 1/1 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%



 [OK] No errors

(version 2.1.18)

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