php-in-php: class_exists()/interface_exists() JIT via VmReflection PHP (#16185)

[PurHur]

Summary

Migrates class_exists() and interface_exists() JIT runtime paths from inline LLVM strcasecmp loops to compiled PHP helpers, matching the pattern merged in #16173 (trait_exists).

• PHP SSOT: VmReflection::classExists() / VmReflection::interfaceExists()
• JIT bridges: ClassExistsJitHelper + InterfaceExistsJitHelper via StringClassExists / StringInterfaceExists (JitVmHelperLink)
• Shrink: JitClassExists.php 56→31 LOC (−25); JitInterfaceExists.php 58→32 LOC (−26); compile-time literal fast paths unchanged (ReflectionBuiltinHelper)
• Kept: JitClassExists::stringDataPtr() — still used by JitFilterId, JitClassUses, JitGetClassMethods
• No new C in lib/AOT/runtime/ (floor unchanged: phpc_progress.c SIGSEGV handler only)

Closes #16185

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter ClassInterfaceExistsRuntimeShrinkTest'
# OK (6 tests, 22 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/compliance/JITTest.php --filter class_exists_runtime'
# OK (2 tests, 2 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/compliance/JITTest.php --filter builtin_interface_exists'
# OK (2 tests, 2 assertions)

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

php-src reference

• ext/standard/basic_functions.c — PHP_FUNCTION(class_exists) / PHP_FUNCTION(interface_exists)

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