php-in-php: route version_compare JIT through VersionCompareJitHelper PHP (#9813)

[PurHur]

Summary

• Add ext/standard/VersionCompareJitHelper.php delegating to VmInfo::version_compare() (php-src ext/standard/versioning.c SSOT).
• Rewrite StringVersionCompare.php as thin JIT/AOT bridge (same pattern as php-in-php: JIT StringStrtokJit — route strtok() through VmString PHP not ~480-line phpc_strtok LLVM (#1492) #9812 StrtokJitHelper).
• Shrink StringVersionCompareJit.php from ~805 lines to 16-line compat shim (−792 LLVM lines).

C runtime shrink

No new C. Remaining duplicate was LLVM-only (StringVersionCompareJit.php); phpc_version_compare.c was already deleted.

php-src reference

• ext/standard/versioning.c — php_version_compare
• PHP SSOT: ext/standard/VmInfo.php

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter VersionCompare'
# OK (10 tests, 29 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/maintainer_version_compare_jit.php
php bin/jit.php test/repro/maintainer_version_compare_jit.php'
# 1.0.0 < 1.0.1 => true OK
# 1.0.0 = 1.0.0 => true OK
# 1.0.0-dev < 1.0.0 => true OK
# 8.2.0 < 8.10.0 => true OK
# -1  (operator-less int return)

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK

php script/check-selfhost-spine-coverage-sync.php
# OK (spine covers all 2792 inventory files)

Closes #9813

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