Stdlib: uasort/array_uasort JIT lowering via UsortRuntime (#5698)

[PurHur]

Summary

Fixes incorrect JIT/AOT routing for uasort() / array_uasort() — uasort_::call() previously invoked SortRuntime::sortPacked() (packed sort() semantics, wrong for key-preserving value sort).

php-src reference

• php/php-src ext/standard/array.c — php_array_uasort / php_array_usort

PHP implementation

• lib/JIT/Builtin/UsortRuntime.php — new uasortValues(): strcmp → __hashtable__sortStringKeyValues (assoc string keys) or SortRuntime::sortPacked (packed lists); closure → UsortJitHelper::sortValuesWithClosure bridge
• ext/standard/uasort_.php — call() delegates to UsortRuntime::uasortValues
• ext/standard/UsortJitHelper.php — sortValuesWithClosure; exportKeyValuePairs for nested JIT (php-in-php: delete StringStrtrStandaloneLlvm — route standalone AOT through StrtrArrayJitHelper PHP (#9392 completion) #12908)
• ext/standard/ValueSortJitHelper.php — exportKeyValuePairs in apply path

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/jit.php test/repro/agent_aot_uasort_strcmp.php
php bin/jit.php test/repro/agent_aot_array_uasort.php
php bin/jit.php test/compliance/cases/stdlib/uasort_jit.phpt
'
php vendor/bin/phpunit --filter UsortRuntimeShrinkTest
php vendor/bin/phpunit --filter ValueSortRuntimeShrinkTest

Output:

a:apple
c:mango
b:zebra
array (
  'a' => 1,
  'b' => 2,
)
apple,mango,zebra
OK (2 tests, 27 assertions)
OK (3 tests, 9 assertions)

AOT note: php bin/compile.php currently fails LLVM module verify in this environment (pre-existing __value__writeHashtable mismatch, including echo 42). AOT fixtures added (uasort_assoc_strcmp.phpt, array_uasort_closure.phpt) for when that regression is fixed.

Follow-up: VM array_uasort()/array_uksort() aliases still no-op under bin/vm.php while direct uasort()/uksort() work — separate dispatch bug; compliance array_uasort_uksort.phpt fails on VM.

Closes #5698

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