php-in-php: JIT ksort/krsort — route LLVM through KeySortJitHelper PHP (#1492)

[PurHur]

Summary

Route JIT/AOT ksort() / krsort() LLVM (__hashtable__sortStringKeys*) through PHP KeySortJitHelper + KeySortRuntime (VmArray::ksortCopy/krsortCopy SSOT).

php-src ref

• ext/standard/array.c — php_array_ksort / php_array_krsort

Done when

• ksort_.php / krsort_.php JIT uses KeySortRuntime::*
• KeySortRuntimeShrinkTest green; bootstrap VM driver probe green

[PurHur]

claim: PHP Runtime → PHP — batch (issues #12769, #12770, #12771)

[PurHur]

Merged via #12774. KeySortRuntime routes ksort/krsort JIT through VmArray PHP SSOT. Verified: KeySortRuntimeShrinkTest OK + bootstrap-selfhost-vm-driver-execute-probe OK.