Language: class_alias allows internal class originals like Zend (#29084)

[PurHur]

Summary

• Closes Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 — class_alias('stdClass', $fresh) / Exception return true and instantiate correctly (php-src zif_class_alias).
• Removes the over-broad internal-class ValueError from Stdlib: class_alias('stdClass','stdClass') ValueError not Warning (#18290) #18300 in Context::registerClassAlias and JIT Object_::registerClassAlias.
• Duplicate class_alias('stdClass', 'stdClass') now matches Zend: Warning + false (not ValueError).

Test plan

• ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/issue_29084_class_alias_internal.php'
• same with bin/jit.php
• vendor/bin/phpunit test/unit/ClassAliasInternal29084Test.php → OK (2 tests)
• PHPT bodies for class_alias_internal, class_alias_internal_duplicate, warnings, enum TypeError via bin/vm.php
• Note: full VMTest data-provider is currently broken on master by unrelated --EXTENSIONS-- PHPTs (method_property_exists_string_autoload_jit, is_a_subclass_string_autoload_jit); compliance .phpt files updated for when that clears.

php-src

• Zend/zend_builtin_functions.c — PHP_FUNCTION(class_alias)

Gate snapshot (pre-claim)

• bootstrap-selfhost-link: partial — stale gen-0 drivers, fell back to Zend gen-0 compile of compiler_minimal (long-running; stopped after recording symptom).
• Inventory --check exit 0.

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