Stdlib/AOT: DOMXPath::evaluate() dedicated LLVM leaf (#18526)

[PurHur]

Summary

• Add dedicated user-script AOT path for DOMXPath::evaluate() (re-Stdlib/AOT: DOMXPath::query()/evaluate() compile fatal in user-script standalone (ext/dom/xpath.c, #6066 follow-up) #18493 gap): JitDomXPathEvaluate, compile-time boolean()/count() fast path, and scalar runtime bridges via DomXPathEvaluateJitHelper
• Move domxpath::evaluate from generic VmDomInstanceInvoke to USER_SCRIPT_DIRECT_METHODS (same pattern as query())
• Spine + inventory sync for new DOM JIT units

php-src reference

• ext/dom/xpath.c — dom_xpath_object_evaluate_read

PHP implementation

• ext/dom/JitDomXPathEvaluate.php, JitDomXPathEvaluateUserScript.php, DomXPathEvaluateJitHelper.php
• lib/JIT/Call/DomXPathEvaluate.php, lib/JIT/Builtin/DomXPathEvaluateRuntime.php
• lib/JIT/DomInstanceMethodJit.php — register dedicated proxy

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/maintainer_gap_dom_xpath_evaluate_aot.php'
# 1
# 1

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/compile.php -o /tmp/xe test/repro/maintainer_gap_dom_xpath_evaluate_aot.php && /tmp/xe; echo exit=$?'
# 1
# 1
# exit=0

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/aot/AotTest.php --filter dom_xpath'
# OK (2 tests, 10 assertions)

php bin/vm.php test/compliance/cases/stdlib/dom_xpath_evaluate_boolean.phpt
# 1
# 1

php script/check-selfhost-spine-coverage-sync.php
# (green)

Closes #18526

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