php-in-php: route ob_get_status JIT through ObStatusJitHelper PHP (#9497)

[PurHur]

Summary

• Add ext/standard/ObStatusJitHelper.php as SSOT for ob status numeric fields (type, flags, level, buffer_used, …).
• Rewrite lib/JIT/Builtin/ObStatusRuntime.php to compile the helper and call buildStatusEntryPartial() from thin LLVM bridges; handler name string stays a one-line LLVM __hashtable__setStringKeyString attach (JIT helper compile cannot use Variable::string() today — same constraint as GcStatusJitHelper).
• VmOb delegates status row assembly to the shared helper for VM/JIT parity.
• Removed LLVM __phpc_ob_status_entry and __hashtable__setStringKeyLong numeric field emission (~60 lines of duplicated hashtable builder).

php-src reference

• ext/standard/output.c — PHP_FUNCTION(ob_get_status), ob_list_handlers

LLVM shrink

File	Before	After
lib/JIT/Builtin/ObStatusRuntime.php	396 lines	453 lines (bridge + helper compile glue; numeric row body moved to PHP)
Deleted symbols	__phpc_ob_status_entry, implementStatusEntry LLVM numeric setStringKeyLong chain

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter ObStatusRuntimeShrink'
# OK (3 tests, 8 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/compliance/cases/stdlib/ob_get_status.phpt
php bin/jit.php test/compliance/cases/stdlib/ob_get_status.phpt'
# VM + JIT output identical:
# 0:default output handler:1
# 1:0:1
# 1:5
# 2:0:1:5
# 1

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK

php script/check-selfhost-spine-coverage-sync.php
# OK

Closes #9497

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