Stdlib: fix AOT sys_getloadavg() + count() on boxed arrays (#27294)

[PurHur]

Summary

• Closes Regression: AOT sys_getloadavg() segfaults after build — VM/JIT match Zend (ext/standard/basic_functions.c) #27294 — thin AOT sys_getloadavg() no longer segfaults when consuming the return array (is_array / count).
• NestedJIT of HashTable is not a real __hashtable__* under thin AOT (peer gc_status Regression: AOT gc_status() compile fails — Current basic block has no parent function (Zend/zend_builtin_functions.c) #26943 / cal_info Stdlib: AOT/JIT cal_info() still refused — re-#7252 (ext/calendar/calendar.c) #27354). Bridge now takes NestedJIT scalars (resolveOk / loadAt) and materializes via __hashtable__alloc + __hashtable__setDoubleAt.
• Also fixes AOT count([1,2,3]) abort introduced by Regression: AOT SplFixedArray::fromArray compile fails — object::count() (ext/spl/spl_fixedarray.c) #26793/Stdlib: AOT SplFixedArray::fromArray via __spl_ht + Countable count (#26793) #26918: count() on TYPE_VALUE must branch on the value-box type tag before Countable/SplFixedArray::count dispatch.

php-src: ext/standard/basic_functions.c — PHP_FUNCTION(sys_getloadavg); ext/standard/array.c — php_count.

Test plan

• Issue repro via ./script/docker-exec.sh — Zend/VM/JIT/AOT print before\nafter\n3
• AOT binary 10/10 identical (exit 0)
• count([1,2,3]) / count([]) AOT OK; SplFixedArray::fromArray count still 3
• vendor/bin/phpunit --filter VmSysGetloadavgRuntimeShrinkTest — OK
• vendor/bin/phpunit --filter AotRegressionFixtureCatalogTest — OK
• php script/bootstrap-inventory.php --check — OK 6928/6928

Exact verification

./script/docker-exec.sh -- bash -lc '
source script/php-env.sh
cat > /tmp/loadavg.php <<P
<?php
echo "before\n";
$a = sys_getloadavg();
echo "after\n";
echo is_array($a) ? count($a) : "notarr", "\n";
P
php /tmp/loadavg.php
php bin/vm.php /tmp/loadavg.php
php bin/jit.php /tmp/loadavg.php
php bin/compile.php -o /tmp/loadavg.bin /tmp/loadavg.php
for i in 1 2 3 4 5 6 7 8 9 10; do /tmp/loadavg.bin; echo exit=$?; done
'
# → before/after/3 ×10, exit=0

Not covered: full ci-local.sh / compliance suites; bootstrap-selfhost-link (stale gen-0 → Zend fallback, terminated after ~20m compile).

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