Stdlib: PHP 8.5 max_memory_limit INI ceiling (#23232)

[PurHur]

Summary

• Closes Stdlib: max_memory_limit INI missing on PROFILE=8.5 — memory_limit ceiling (main/ini) #23232: register max_memory_limit under PHP_COMPILER_PROFILE=8.5 (default "-1", INI_SYSTEM)
• Runtime ini_set('max_memory_limit') rejected; -d / --INI-- startup applies Zend OnChangeMaxMemoryLimit (sets both ceiling and memory_limit)
• ini_set('memory_limit', …) above a finite ceiling warns and clamps; unlimited (-1) clamps silently — php-src main/main.c
• Absent on PROFILE<8.5 (ini_get / get_cfg_var false)

PHP-in-PHP: ext/standard/VmIni.php + IniJitHelper.php; gate CompilerVersion::supportsMaxMemoryLimit().

Test plan

• Issue repros:

PHP_COMPILER_PROFILE=8.5 php bin/vm.php test/repro/maintainer_gap_max_memory_limit_ini_85.php
# => default-ok
PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_max_memory_limit_ini_absent.php
# => absent-ok
PHP_COMPILER_PROFILE=8.5 php bin/vm.php -d max_memory_limit=64M test/repro/maintainer_gap_max_memory_limit_ini_85_ceiling.php
# => ceiling-ok

• vendor/bin/phpunit --exclude-group llvm --filter max_memory_limit → OK (6 tests)
• php script/bootstrap-inventory.php --check → OK 6561/6561

Pre-claim gates: bootstrap-selfhost-link OK; inventory OK; release-readiness user_release_ready: yes; helloworld OK.

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