Language: Fiber JIT/AOT resume lowering (#4019)

[PurHur]

Summary

• Add FiberHelper MCJIT/AOT lowering for fiber callbacks with Fiber::suspend() resume points (php-src Zend/zend_fibers.c).
• Register Fiber::__construct, start, resume JIT calls; fiber closures compile to {closure}_N__fiber_resume switch functions.
• AOT native execute is green; bin/jit.php uses existing VM fallback via Block::requiresVmLowering() until MCJIT execute segfault is fixed (tracked in Language: Fiber JIT/AOT — native suspend/resume (phase 2 of #3130) #4019).

php-src reference

• php/php-src Zend/zend_fibers.c

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro-maintainer/fiber_jit_repro.php'
# ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php test/repro-maintainer/fiber_jit_repro.php'
# ok (VM fallback — requiresVmLowering for Fiber::suspend in script)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php -o /tmp/fiber_aot test/repro-maintainer/fiber_jit_repro.php && /tmp/fiber_aot'
# ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter fiber_suspend test/aot/AotTest.php'
# OK (1 test)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter fiber_jit test/compliance/VMTest.php'
# OK (1 test)

Closes #4019

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