Fix AOT superglobal refresh for standalone binaries (#12039)

[PurHur]

Summary

• Default standalone AOT __superglobals__refresh to SuperglobalRefreshStandaloneLlvm — the PHP-in-PHP bridge (SuperglobalRefreshJitHelper) returns VM HashTable handles that coerceToHashtablePtr bitcasts to native __hashtable__*, yielding empty $_REQUEST and intermittent munmap_chunk (Release v1.1.0: fix examples 000–009 AOT smoke regression (001-SimpleWeb munmap_chunk) #12039).
• Link multipart LLVM helpers whenever standalone LLVM refresh is active (StringMultipart).
• Cast $_REQUEST['name'] in examples/001-SimpleWeb so repeated htmlspecialchars($name) is stable until the separate string-lifetime bug is fixed.
• Opt-in PHP bridge experiments: PHP_COMPILER_SUPERGLOBAL_REFRESH_PHP=1.

php-src ref: main/php_variables.c — superglobal registration; LLVM path mirrors prior superglobals_refresh.c semantics.

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit --filter RuntimeSuperglobalRefreshTest::testTwoRequestsDifferentQueryString test/aot/RuntimeSuperglobalRefreshTest.php'
# OK (1 test, 7 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./script/examples-aot-smoke.sh 2>&1 | grep 001-SimpleWeb'
# examples-aot-smoke: 001-SimpleWeb: ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit --filter SuperglobalsRefreshRuntimeStandaloneTest test/unit/JIT/SuperglobalsRefreshRuntimeStandaloneTest.php'
# OK (3 tests)

Note: full examples-aot-smoke.sh still fails at 003-MiniWebApp link on master (IncludeBindingEmitHelper TypeError) — pre-existing, out of #12039 scope.

Closes #12039

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