php-in-php: array_find family closure JIT via ArrayFindJitHelper PHP (#17547)

[PurHur]

Summary

Phase 2 of #14842: route closure/arrow array_find family callbacks through nested ArrayFindJitHelper::walkWithClosure PHP instead of LLVM hashtable walk loops in ArrayFindHelper.

• Add walkWithClosure() — reuses VmClosureCall + VmArrayValueCallback::predicateMatches (php-src parity)
• Extend ArrayFindRuntime with __array_find__closure JitVmHelperLink bridge (php-in-php: JIT ArrayFindHelper — route closure callbacks through ArrayFindJitHelper PHP not LLVM loops (#1492) #17547)
• ArrayFindHelper::buildFromArray delegates closures early; removes dead resolvePredicateHandler closure branch

C runtime shrink

No new C. LLVM closure walk path bypassed for JIT/AOT; user-function proxies still use ArrayFindHelper LLVM (next slice).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/ArrayFindRuntimeShrinkTest.php'
# OK (1 test, 6 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && PHP_COMPILER_PROFILE=8.4 php bin/jit.php -r "
\$arr = [1, 2, 3];
var_export(array_find(\$arr, fn (\$v) => \$v === 2));
echo \"\n\";
\$a = [1 => \"a\", 2 => \"b\"];
var_export(array_find_key(\$a, fn (\$k, \$v) => \$k === 2));
echo \"\n\";
var_export(array_find(\$arr, fn (\$v) => \$v === 2, true));
"'
# 2
# 2
# 2

Closes #17547

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