Stdlib: lower ldap_count_entries through JIT helper bridge (#32172)

[PurHur]

Summary

• JIT/AOT no longer throw LogicException for ldap_count_entries(); lowering goes through JitLdapResult::invokeCountEntries + LdapResultJitHelper::countEntriesArgv and reuses VmLdapNative::countEntries (php-src ext/ldap/ldap.c).
• LDAP\Result handles from JIT ldap_bind_ext() are registered the same way ldap_connect() registers connections, so compiled count/walk APIs can look up live results.
• Invalid-handle TypeErrors for $ldap / $result match the VM path.

Closes #32172

php-src reference

• https://github.com/php/php-src/blob/master/ext/ldap/ldap.c (PHP_FUNCTION(ldap_count_entries))
• https://github.com/php/php-src/blob/master/ext/ldap/ldap.stub.php

PHP implementation

• ext/ldap/ldap_search_builtins.php — call() → JitLdapResult::invokeCountEntries
• ext/ldap/JitLdapResult.php / ext/ldap/LdapResultJitHelper.php — LLVM lowering + helper
• ext/ldap/VmLdapResult.php — JIT result handle map
• lib/JIT/Builtin/LdapRuntime.php — __compiler_ldap_count_entries / __compiler_ldap_result_register
• No new runtime/*.c

Test plan

• Issue repro VM + JIT
• AOT compile + run (phpc build; standalone has no libldap FFI so connect skips)
• Targeted PHPUnit (LdapCountEntries*, LdapRuntimeShrinkTest)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_ENABLE_LDAP=1 php bin/vm.php test/repro/issue_32172_ldap_count_entries_jit.php'
fn=1
bad_conn=typeerror
bad_result=typeerror
bind_ext=false
ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_ENABLE_LDAP=1 php bin/jit.php test/repro/issue_32172_ldap_count_entries_jit.php'
fn=1
bad_conn=typeerror
bad_result=typeerror
bind_ext=false
ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_HELPER_RUNTIME_O=1 PHP_COMPILER_ENABLE_LDAP=1 ./phpc build -o /tmp/ldap_count_entries_32172 test/repro/issue_32172_ldap_count_entries_jit.php && /tmp/ldap_count_entries_32172'
fn=1
connect=0
ok

./script/phpunit.sh --filter 'LdapCountEntriesJitHelperTest|LdapRuntimeShrinkTest|LdapCompareJitHelperTest|LdapBindExtJitHelperTest'
OK, but incomplete, skipped, or risky tests!
Tests: 12, Assertions: 79, Skipped: 1.

Standalone AOT has no OpenLDAP FFI (ldap_connect() cannot create a session handle), so the AOT binary skips the live count path after compiling ldap_count_entries (no LogicException). VM/JIT exercise the TypeError path in-process.