php-in-php: class_implements() JIT via ClassImplementsJitHelper PHP (#16960)

[PurHur]

Summary

• Add ClassImplementsJitHelper (SSOT: VmReflection::resolveClassForClassImplements() + classImplementsArray()) and StringClassImplements thin __phpc_jit_class_implements bridge via JitVmHelperLink.
• JitClassImplements keeps compile-time literal / TYPE_OBJECT / boxed-object LLVM fast paths (AOT parity); routes other dynamic operands through PHP helper instead of rejecting at compile time.
• Spine includes helper + bridge; ClassImplementsRuntimeShrinkTest guard.

Closes #16960

php-src reference

• ext/standard/basic_functions.c — PHP_FUNCTION(class_implements)

PHP implementation

• ext/standard/ClassImplementsJitHelper.php — runtime SSOT
• lib/JIT/Builtin/StringClassImplements.php — JIT/AOT ABI bridge
• ext/standard/JitClassImplements.php — compile-time fast paths + routeThroughPhpHelper()

Verification (Docker)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter ClassImplementsRuntimeShrinkTest'
# OK (4 tests, 10 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter class_implements'
# OK (17 tests, 25 assertions) — VM + JIT + AOT fixtures

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

Note: php script/check-selfhost-spine-coverage-sync.php is red on master for unrelated LazyProperty spine drift (#16958); not introduced by this diff.

Made with Cursor