WIP: DOM AOT instance bridge — nested Variable::toObject + per-arity invoke (#17391)

[PurHur]

Summary

• Add VariableToObject nested JIT handler so VariableObject::entry() lowers in VmDomInstanceInvoke helper TUs (Stdlib/AOT: DOM instance methods segfault in user-script standalone binary (ext/dom, #16075) #17391).
• Fix VmDomJitFrame to read VM context from Superglobals::getActiveContext() (AOT has no executing PHP frame).
• Refactor DomInstanceMethodRuntime to per-arity bridges (__phpc_jit_dom_instance_method_{0..4}) instead of args-table unpack — aligns with Stdlib: ext/dom PHP 8.4 Living Standard — JIT/AOT compliance batch (DOMTokenList, insertAdjacent*, innerHTML) #17130 / WIP: DOM PHP 8.4 instance methods — JIT/AOT bridge (#17130) #17331 direction.

php-src reference

N/A (compiler AOT); behavior target: ext/dom/php_dom.c instance handlers once binary runs.

PHP implementation

• lib/JIT/Call/VariableToObject.php, lib/JIT/NestedVmVariableMethodLlvm.php
• ext/dom/VmDomInstanceInvoke.php, ext/dom/VmDomJitFrame.php
• lib/JIT/Builtin/DomInstanceMethodRuntime.php, lib/JIT/Call/DomInstanceMethod.php

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/maintainer_gap_dom_create_element_aot.php'
# p

php bin/jit.php test/repro/maintainer_gap_dom_create_element_aot.php
# p

php bin/compile.php -o /tmp/dom_create test/repro/maintainer_gap_dom_create_element_aot.php
# compile exit 0

/tmp/dom_create; echo exit=$?
# exit=134 (Aborted) — execute tier still red; was exit=139 segfault before this branch

vendor/bin/phpunit test/unit/NestedVmVariableToObjectTest.php test/unit/DomInstanceMethodJitTest.php --no-configuration
# OK

./script/ci-fast.sh
# exit 0

Blocker (not merge-ready)

Standalone AOT compile succeeds (incl. new test/fixtures/aot/compile-only/dom_create_element.php), but runtime aborts when the first DOMDocument::createElement() bridge runs. new DOMDocument() alone is fine under AOT.

Next step: user-script AOT defer path with class-id dispatch (no ObjectEntry PHP property reads in split-compilation helper TUs) or prelinked helper-runtime unit + ctor init (#16075) — same class as #17331.

Progress on #17391 — not closing yet.

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