Language: class const object expressions JIT/AOT (#4021)

[PurHur]

Summary

• Materialize PHP 8.3 class constants with new object expressions as immortal module-global __object__* singletons in __init__ (allocateClassConstantObject, non-refcounted header, no GC registration).
• php-src reference: Zend/zend_compile.c — zend_compile_const_expr; Zend/zend_constants.c — persistent constant values.
• Capability row class_const_object: VM/JIT/AOT yes; JIT MCJIT execute remains harness-unstable (CI: Run JIT compliance tests in CI (fix LLVM skip in PHPUnit) #98) — guarded by ClassConstObjectJitCompileTest (LLVM module verify).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/compliance/cases/language/class_const_object_run.php'
# 1\n1\n

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php -o /tmp/cco test/compliance/cases/language/class_const_object_run.php && /tmp/cco'
# 1\n1\n

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter ClassConstObjectJitCompileTest'
# OK (1 test, 4 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "VMTest::testCases.*class_const_object|AotTest::testCases.*class_const_object"'
# OK (2 tests, 6 assertions)

Closes #4021

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