PHP 8 - Repair php cli segfault when using `jit=1255`

[kneitinger]

Summary

Internal testing shows that tests segfault when using php and jit=1255. For this issue, repair any and all segfaults when using 1255, and if current tests do not adequately cover these cases, add such tests the the appropriate suite.

Desired Behavior

php based applications do not trigger segmentation faults when jit=1255

Additional context

• PHP 8 JIT Source
• Internal team mobbing session gdb walkthrough
• Interestingly enough, such crashes are not seen when using php-cgi

[zsistla]

A change going into 8.0.1 will disable JIT for third party extensions that override zend_execute_ex (we do).
php/php-src@d5a82e2#diff-9faa6c4e1812bb88ee722439bfa2d0b48c8034871c2a625e00d14e6dbfbb835cR4180

An alternative might be a new Observer API that is supposed to help with this:
Observer api: php/php-src#5857

After pulling down the 8.0.1 change and recompiled PHP and our agent.
After running PHP-CLI with our agent, it no longer segfaults, but it says:
Warning: JIT is incompatible with third party extensions that override zend_execute_ex(). JIT disabled. in Unknown on line 0

[neclimdul]

darn, was looking forward to playing with jit. glad its no longer a roadblock to running the agent though.

If memory serves observer api was written specifically to be a lighter weight tool for things exactly like newrelic so hope that works out.