php-in-php: delete JitRename libc defer — kernel bridge (#19215)

[PurHur]

Summary

• Remove JitRename::invokeLibc and UserScriptAotDeferNestedJit defer from the rename JIT path; JitRename always delegates to StringRename.
• User-script AOT StringRename bridge now calls JitRenameKernel (thin libc rename(2)) and invalidates stat cache via StatCacheJitHelper::clearPath after success.
• Add @internal phpc_rename_kernel + JitRenameKernel so RenameJitHelper helper units avoid rename() builtin recursion; refresh prelinked RenameJitHelper unit (c2e3d15b9c70bbb71e64).

C removed: ~20 lines invokeLibc LLVM from ext/standard/JitRename.php.

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/RenameRuntimeShrinkTest.php
vendor/bin/phpunit test/unit/RenameBuiltinTest.php --filter testVmMatchesPhpSubset
make bootstrap-selfhost-vm-driver-execute-probe
vendor/bin/phpunit test/unit/RenameBuiltinTest.php --filter testAotNativeBinaryMatchesPhpSubset
'

• RenameRuntimeShrinkTest — OK (Zend delegate test skipped; source guards OK)
• RenameBuiltinTest::testVmMatchesPhpSubset — OK
• bootstrap-selfhost-vm-driver-execute-probe — OK
• RenameBuiltinTest::testAotNativeBinaryMatchesPhpSubset — partial: rename() returns true (ok + moved), but is_file($to) still nonew (stat cache coherence across prelinked StatPath vs StatCache helper TUs; same shape as master libc defer)

Merge status

Not merging — AOT repro not fully green (is_file($to) after successful rename). Follow-up needed on helper-runtime VmStatCache TU coherence before closing #19215.

Closes #19215 when follow-up lands.

Made with Cursor

[PurHur]

Maintainer: holding merge — AOT is_file($to) after rename still nonew (stat-cache TU coherence). Prefer one landing PR for #19215 once execute parity is complete; close the duplicate slice when the other merges.

[PurHur]

Superseded by #19248 (AOT is_file kernel + rename done-when green).