Bootstrap: spine sync ReflectionFunction/Method::isGenerator (#17521)

[PurHur]

Summary

• Adds ReflectionFunctionIsGenerator.php and ReflectionMethodIsGenerator.php to test/selfhost/compiler_lib_spine_smoke/main.php
• Fixes check-selfhost-spine-coverage-sync regression from Stdlib: ReflectionFunction/Method::isGenerator() (#17505) #17511 (ReflectionFunction/Method::isGenerator())

Closes #17521

Root cause

PR #17511 added VM builtin units for ReflectionFunction::isGenerator() and ReflectionMethod::isGenerator() but did not update the self-host spine bundle.

Verification

./script/docker-exec.sh -- bash -lc 'php script/check-selfhost-spine-coverage-sync.php'
# check-selfhost-spine-coverage-sync: OK (spine covers all 4308 inventory files)

./script/docker-exec.sh -- bash -lc 'make north-star5-verify-fast'
# north-star5-verify: OK (fast)

./script/docker-exec.sh -- bash -lc './script/release-readiness.sh --json'
# user_release_ready: yes, gates 5/5 ok

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