Self-host: add DOM validate/save JIT units to compile spine (#35540)

[PurHur]

Summary

Five DOM JIT units from the #35540 / #35546 / #35549 AOT landings were on the bin/vm.php inventory (7959 files) but missing from compiler_lib_spine_smoke/main.php. After bootstrap-inventory.php regen during north-star5-verify-fast, step 2 failed at 7954/7959 with:

• ext/dom/DomDocumentValidateJitHelper.php
• ext/dom/JitDomSave.php
• lib/JIT/Builtin/DomDocumentValidateRuntime.php
• lib/JIT/Call/DomDocumentSave.php
• lib/JIT/Call/DomDocumentValidateMethod.php

Same class of fix as #35441 (ZipArchive NestedJIT spine sync).

Test plan

./script/docker-exec.sh -- bash -lc 'php script/check-selfhost-spine-coverage-sync.php && php script/bootstrap-spine-count.php'
# check-selfhost-spine-coverage-sync: OK (spine covers all 7959 inventory files)
# bootstrap-spine-count: 7959/7959

make north-star5-verify-fast
# north-star5-verify: OK (fast)

./script/phpunit.sh --filter 'DomDocumentValidate35540AotTest|DomDocumentSave35546AotTest'
# OK (4 tests, 23 assertions)

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

Closes #35540 (spine sync leftover; AOT lowering already merged)

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