php-in-php: route get_class class-id LLVM through GetClassJitHelper (#10222)

[PurHur]

Summary

• Add GetClassJitHelper + GetClassRuntime thin bridge (__phpc_class_name_from_id)
• ReflectionBuiltinHelper::classNameFromId no longer emits per-class LLVM select chain (~14 LOC removed)
• Per-compile-unit class table embedded when nested helper is compiled

Closes #10222 (partial — literal reflection helpers already PHP at compile time; runtime get_class path migrated)

php-src reference

• ext/standard/basic_functions.c — PHP_FUNCTION(get_class)
• Zend/zend_builtin_functions.c — zend_get_object_classname

LLVM shrink

• ReflectionBuiltinHelper.php: 336 → 332 lines; removed allClassNamesById() select loop in classNameFromId

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
./vendor/bin/phpunit --filter "ReflectionBuiltinHelperRuntimeShrinkTest|GetClassRuntimeStandaloneTest"
php bin/vm.php -r "class C {} echo get_class(new C());"
php bin/jit.php -r "class C {} echo get_class(new C());"
php script/check-selfhost-spine-coverage-sync.php
'

OK (4 tests, 14 assertions)
C
C
check-selfhost-spine-coverage-sync: OK

./script/ci-fast.sh — green

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