Stdlib web batch: hash/preg verify + filter self-host AOT (#1119, #1121, #1122)

[PurHur]

Summary

• Register filter_var and filter_input in SelfHostBuiltinPolicy so PHP_COMPILER_SELFHOST_AOT=1 uses real JIT lowering instead of external stubs (Stdlib: filter_var + filter_input for web forms #1122).
• Confirm existing bootstrap fixtures stdlib_hash and stdlib_preg already pass AOT link and self-host AOT compile/run (Stdlib: hash() and hash_hmac() JIT/AOT #1119, Stdlib: preg_match JIT + bootstrap stdlib_preg #1121).
• Teach script/audit-stdlib-jit.php to recognize JitFilter:: lowering; audit now reports zero missing JIT builtins.

Fixtures verified OK

Fixture	bootstrap-aot-link	self-host AOT (PHP_COMPILER_SELFHOST_AOT=1)
test/bootstrap-aot/stdlib_hash.php	OK	OK
test/bootstrap-aot/stdlib_preg.php	OK	OK
test/bootstrap-aot/stdlib_filter.php	OK	OK (was 0m vs 420m before policy fix)

Test plan

• ./vendor/bin/phpunit --filter SelfHostBuiltinPolicyTest
• Individual compile+run for stdlib_hash, stdlib_preg, stdlib_filter under self-host AOT
• make bootstrap-selfhost-probe — still blocked by unrelated ConstStringFolder LLVM verify (Instruction does not dominate all uses!); not introduced by this PR

Closes #1119, #1121, #1122

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