php-in-php: route spaceship object/hashtable JIT through CompareJitHelper (#9476)

[PurHur]

Summary

• Add CompareJitHelper::objectSpaceship() and hashtableSpaceship() delegating to ObjectEntry::compareSpaceship() / HashTable::compareSpaceship() (php-src: Zend/zend_operators.c, zend_compare_objects, zend_compare_arrays)
• JIT embed routes __object__compareSpaceship / __hashtable__compareSpaceship through thin LLVM bridges calling compiled PHP helpers (php-in-php: JIT SpaceshipCompareJit — route <=> through CompareJitHelper PHP not ~1.2k-line LLVM (#1492) #9476)
• Standalone AOT keeps existing LLVM walkers until nested standalone link supports ObjectEntry/HashTable helpers
• SpaceshipRuntime compiles new helpers under NestedJitCompileScope (Audit php-in-PHP JIT helpers: require NestedJitCompileScope on master #10529)

Closes #9476

php-src reference

• Zend/zend_operators.c — compare_function / spaceship
• Zend/zend_object_handlers.c — object compare
• Zend/zend_hash.c — array compare

PHP implementation

• lib/VM/CompareJitHelper.php — SSOT for scalar + object + hashtable spaceship
• lib/JIT/Builtin/SpaceshipCompareJit.php — embed bridges (emitObjectCompareSpaceshipBridge, emitHashtableCompareSpaceshipBridge)

Verification

vendor/bin/phpunit test/unit/SpaceshipCompareJitHelperTest.php
# OK (5 tests, 20 assertions)

php bin/vm.php test/compliance/cases/language/enum_relational_operators.phpt
# bool(false)\nint(1)\nint(1)\nbool(false)\nint(1)

php bin/jit.php test/compliance/cases/language/enum_spaceship.phpt
# int(1)… int(0)… (Zend parity)

php bin/jit.php test/compliance/cases/language/enum_relational_operators.phpt
# bool(false)\nint(1)\nint(1)\nbool(false)\nint(1)

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

Follow-up

Standalone AOT LLVM object/hashtable walkers (~350 lines) can move to SpaceshipCompareStandaloneLlvm.php once nested standalone compile accepts ObjectEntry/HashTable helpers.

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