fix memleak / crashes

[realFlowControl]

Should fix #316

I need to understand this a bit more. The hint from @arnaud-lb works from PHP 8.2, 8.3 and 8.4-rc but fails in PHP 8.1.
Switching from ZEND_MAP_PTR_NEW to ZEND_MAP_PTR_INIT(function->op_array.run_time_cache, NULL) makes PHP 8.0 and 8.1 segfault in the tests

[realFlowControl]

PHP 8.1.30 without OPcache

ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0xaaaadc558d88 bp 0xffff7620a5e0 sp 0xffff7620a5e0 T5)
==22746==The signal is caused by a READ memory access.
==22746==Hint: address points to the zero page.
    #0 0xaaaadc558d88 in zend_gc_addref /usr/src/php/Zend/zend_types.h:1191
    #1 0xaaaadc558d88 in _object_properties_init /usr/src/php/Zend/zend_API.c:1522
    #2 0xaaaadc558d88 in _object_and_properties_init /usr/src/php/Zend/zend_API.c:1665
    #3 0xaaaadc558d88 in object_init_ex /usr/src/php/Zend/zend_API.c:1682
    #4 0xaaaadc8306fc in ZEND_NEW_SPEC_VAR_UNUSED_HANDLER /usr/src/php/Zend/zend_vm_execute.h:28924
    #5 0xaaaadc9d845c in execute_ex /usr/src/php/Zend/zend_vm_execute.h:58485
    #6 0xffff893cb7a8 in php_parallel_scheduler_run /parallel/src/scheduler.c:337
    #7 0xffff893cbd14 in php_parallel_thread /parallel/src/scheduler.c:507
    #8 0xffff8cc6ee2c  (/lib/aarch64-linux-gnu/libc.so.6+0x7ee2c)
    #9 0xffff8ccd7ad8  (/lib/aarch64-linux-gnu/libc.so.6+0xe7ad8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /usr/src/php/Zend/zend_types.h:1191 in zend_gc_addref
Thread T5 created by T1 here:
    #0 0xffff8da4a234 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:207
    #1 0xffff893cc020 in php_parallel_scheduler_start /parallel/src/scheduler.c:525
    #2 0xffff893cb220 in php_parallel_runtime_construct /parallel/src/runtime.c:35
    #3 0xffff893ca7e8 in php_parallel_runtimes_fetch /parallel/src/parallel.c:103
    #4 0xffff893ca7e8 in php_parallel_run /parallel/src/parallel.c:131
    #5 0xaaaadc99765c in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /usr/src/php/Zend/zend_vm_execute.h:1297
    #6 0xaaaadc99765c in execute_ex /usr/src/php/Zend/zend_vm_execute.h:55816
    #7 0xffff893cb7a8 in php_parallel_scheduler_run /parallel/src/scheduler.c:337
    #8 0xffff893cbd14 in php_parallel_thread /parallel/src/scheduler.c:507
    #9 0xffff8cc6ee2c  (/lib/aarch64-linux-gnu/libc.so.6+0x7ee2c)
    #10 0xffff8ccd7ad8  (/lib/aarch64-linux-gnu/libc.so.6+0xe7ad8)

Thread T1 created by T0 here:
    #0 0xffff8da4a234 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:207
    #1 0xffff893cc020 in php_parallel_scheduler_start /parallel/src/scheduler.c:525
    #2 0xffff893cb220 in php_parallel_runtime_construct /parallel/src/runtime.c:35
    #3 0xffff893ca7e8 in php_parallel_runtimes_fetch /parallel/src/parallel.c:103
    #4 0xffff893ca7e8 in php_parallel_run /parallel/src/parallel.c:131
    #5 0xaaaadc99765c in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /usr/src/php/Zend/zend_vm_execute.h:1297
    #6 0xaaaadc99765c in execute_ex /usr/src/php/Zend/zend_vm_execute.h:55816
    #7 0xaaaadc9f6b88 in zend_execute /usr/src/php/Zend/zend_vm_execute.h:60188
    #8 0xaaaadc540888 in zend_execute_scripts /usr/src/php/Zend/zend.c:1857
    #9 0xaaaadc2d5d94 in php_execute_script /usr/src/php/main/main.c:2551
    #10 0xaaaadcd3ae00 in do_cli /usr/src/php/sapi/cli/php_cli.c:965
    #11 0xaaaadcd3dfdc in main /usr/src/php/sapi/cli/php_cli.c:1367
    #12 0xffff8cc1773c  (/lib/aarch64-linux-gnu/libc.so.6+0x2773c)
    #13 0xffff8cc17814 in __libc_start_main (/lib/aarch64-linux-gnu/libc.so.6+0x27814)
    #14 0xaaaadb5c0aac in _start (/usr/local/bin/php+0x410aac)

==22746==ABORTING