Language: class_alias internal originals ValueError on PROFILE≤8.2 (#29150)

[PurHur]

Summary

• Closes Regression: class_alias(internal) succeeds on PROFILE≤8.2 — Zend ValueError (re-#29084, Zend/zend_builtin_functions.c) #29150 — on PHP_COMPILER_PROFILE=8.1/8.2, class_alias() of internal classes/interfaces throws Zend's ValueError; PROFILE≥8.3 (and default 8.4.0-dev) keep the Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 allow path.
• Gate: CompilerVersion::allowsClassAliasOfInternalClass(); VM Context::registerClassAlias, JIT Object_::registerClassAlias, and JitClassAlias::invokeLiteral (IR ExceptionBridge so try/catch works).

php-src

• Zend/zend_builtin_functions.c — PHP_FUNCTION(class_alias) (PHP-8.2 ValueError vs 8.3+ allow)

Test plan

• Issue repro (exact):

  PHP_COMPILER_PROFILE=8.2 php bin/vm.php /tmp/class_alias_internal_82.php
  PHP_COMPILER_PROFILE=8.2 php bin/jit.php /tmp/class_alias_internal_82.php
  

  → ValueError:class_alias(): Argument #1 ($class) must be a user-defined class name, internal class name given
• test/repro/issue_29150_class_alias_internal_profile82.php — stdClass/Exception/Traversable reject; user class true (VM+JIT PROFILE=8.2); all true on PROFILE=8.4
• PHP_COMPILER_PROFILE=8.4 php bin/jit.php test/repro/issue_29084_class_alias_internal.php — no Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 regression
• vendor/bin/phpunit --filter 'ClassAliasInternalProfile29150Test|ClassAliasInternal29084Test|testAllowsClassAliasOfInternalClass' → OK (8 tests)
• Compliance .phpt: allow cases gated PROFILE=8.3; new class_alias_internal_reject_profile82.phpt

Gate snapshot (pre-claim)

• docker info: ok
• php script/bootstrap-inventory.php --check: red — stale docs/bootstrap-inventory.md DOM helper method-count drift (unrelated; not restamped)
• release-readiness: started; not blocking this language fix

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