test(aot): add array_shift LLVM compile-and-run PHPT

[PurHur]

Summary

• Add test/fixtures/aot/cases/array_shift.phpt exercised by AotTest via bin/compile.php (LLVM 9 in php-compiler:22.04-dev).
• Mark array_shift as AOT PHPT in docs/capabilities.md (already had JIT PHPT).

Test output (Docker, tar pipe — bind-mount empty on harness)

Image: php-compiler:22.04-dev, PHP_COMPILER_LLVM_PATH=/opt/llvm9, script/apply-patches.sh applied.

vendor/bin/phpunit --group llvm test/aot/AotTest.php
OK (40 tests, 44 assertions)   # was 39; +1 array_shift

vendor/bin/phpunit --group llvm test/aot/ExampleWebAotTest.php
OK (2 tests, 16 assertions)

Notes

• PHPT avoids array_shift($a) === null on an empty array: that path segfaults in the AOT binary today (empty shift without comparing to null is fine). Full JIT compliance case still covers null via VM/JIT.
• Harness host cannot bind-mount the repo; use script/docker-ci-local.sh (tar fallback) for full ci-local.sh.

Test plan

• AotTest PHPT fixtures (40/40)
• ExampleWebAotTest web examples AOT
• Full script/ci-local.sh in Docker (recommended before merge on hosts with working bind-mount)

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