[PurHur]

Summary

• Replace UserScriptAotDeferNestedJit::shouldDefer in JitStatPathKernel::implementPathBoolBridge with $context->isThinStandaloneAotMain() (php-in-php: delete StringRename user-script JitRenameKernel defer — always JitVmHelperLink + RenameJitHelper (re-#19215) #20028 / php-in-php: drop UserScriptAotDeferNestedJit from MathNextafter/MathFpow — thin libc via isThinStandaloneAotMain (#1492) #20034 shape).
• Embed / non-thin path still NestedJIT → StatPathJitHelper; thin standalone AOT keeps JitStatKernel libc for file_exists / is_file / …
• Shrink unit test now asserts the defer class is gone.

Closes #20086

C / defer shrink

• Deleted use UserScriptAotDeferNestedJit + shouldDefer() call from ext/standard/JitStatPathKernel.php (net −1 import, gate → isThinStandaloneAotMain).

php-src reference

• ext/standard/filestat.c — php_stat / file_exists / is_file / …

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/StatPathRuntimeShrinkTest.php
# OK (6 tests, 48 assertions)

PHP_COMPILER_AOT_USER_SCRIPT=1 ./phpc build -o /tmp/statpath_aot_smoke … && /tmp/statpath_aot_smoke
# exists1 / file1 / dir1 / r1

make bootstrap-selfhost-vm-driver-execute-probe
# OK /compiler/build/selfhost-lib-spine-smoke
'

Pillar 1 (pre-claim): bootstrap-selfhost-link OK, inventory OK 5441/5441, helloworld OK, release-readiness --json → user_release_ready: yes.

Note: AotTest::stream_supports_lock fails on master too (unrelated; compile exit 255).

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