Fix hash_init/update/final/copy AOT segfault (#3357)

[PurHur]

Summary

Fixes AOT runtime segfault on hash_init() / hash_update() / hash_final() / hash_copy() while preserving working basic hash() AOT.

• Root cause: hash_final/hash_copy routed through HashContextFinalLlvm/HashContextCopyLlvm bridge stubs and nested HashContextJitHelper string returns crashed in standalone user-script AOT.
• Fix: Mirror __hcAlgo/__hcBuf on HashContext object slots; inline finalLowering/copyLowering in JitHashContext; use StringHashCryptoLlvm (__compiler_hash) for standalone AOT final path with __string__init clone before libcrypto digest.
• JIT/VM path: unchanged nested-helper incremental semantics via HashContextJitHelper::finalize().

php-src reference: ext/hash/hash.c

Verification

./script/phpunit.sh --filter 'AotTest.*hash_context_incremental|AotTest.*hash_raw_output|HashModuleTest'
# OK (7 tests, 24 assertions)

php bin/compile.php -o /tmp/h test/repro/hash_context_incremental_aot.php && /tmp/h
# b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
# b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9

php bin/jit.php test/repro/hash_context_incremental_aot.php   # green
php bin/vm.php test/repro/hash_context_incremental.php        # green

Closes #3357

Supersedes broken approach in #17897 (regressed basic hash() AOT).

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