php-in-php: hash standalone defer — skip nested hash_algos/hash_equals JIT (#18717)

[PurHur]

Summary

Rebases the #18717 hash standalone defer work onto current master (stale PR #18717 branch had 185-file drift).

• StringHashCryptoJit: implementDeferred() uses StringHashCryptoLlvm + inline registry + hash_equals stub when UserScriptAotDeferNestedJit — avoids nested HashAlgosJitHelper / HashEqualsJitHelper compile that emits invalid __hashtable__ bridge IR in minimal user-script standalone init.
• StringHashAlgos: defer path builds __compiler_hash_algos from HashAlgosRegistry::ALL_ALGOS inline LLVM (same pattern as StringHashHmacAlgos).
• Embed path unchanged: still routes through HashAlgosJitHelper / HashEqualsJitHelper / HashCryptoJitHelper PHP.

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

LLVM / PHP shrink

• Skips nested PHP JIT helper compile for hash_algos + hash_equals on user-script standalone init (replaces broken nested bridge with thin LLVM registry walk + stub).
• No new C runtime; keeps StringHashCryptoLlvm as documented thin libcrypto EVP bridge for standalone digest (Stdlib: hash_init() / hash_update() / hash_final() / hash_copy() — incremental ext/hash API #3357).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/StringHashAlgosRuntimeShrinkTest.php test/unit/StringHashCryptoRuntimeShrinkTest.php test/unit/JIT/StringHashCryptoRuntimeStandaloneTest.php'
# OK (6 tests)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "HashModuleTest|hash_context_incremental"'
# OK (12 tests)

make bootstrap-selfhost-vm-driver-execute-probe
# OK

Note: Full user-script AOT bin/compile.php -r 'echo hash("sha256","hello");' may still hit the separate master __value__writeHashtable module-verify regression documented on #18717 — this PR fixes the hash-specific nested-JIT defer path only.

Closes #18717

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