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For a megamorphic call the tracing JIT built the observer handler pointer with the ir_PHI_2 operands reversed relative to the ir_MERGE_WITH predecessor order, so a user function read the internal_function_extension slot instead of op_array_extension. When an extension reserves an op_array handle before the observer registers the two indices differ, that slot holds 0, and the JIT calls a NULL begin handler. The default-off zend_test.observer.reserve_op_array_handle INI forces that index mismatch so the regression test can reproduce the crash. Fixes GH-22158 Closes GH-22258
* PHP-8.4: Fix GH-22158: JIT observer dispatch through wrong run_time_cache slot
* PHP-8.5: Fix GH-22158: JIT observer dispatch through wrong run_time_cache slot
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