JIT: fix user-method arg forwarding — AOT late static binding (#1231)

[PurHur]

Summary

• Fixes a regression where compileBlockInternal() gained $startIndex / $allowRecompile parameters but call sites (especially runQueue) still spread LLVM $argVars into positional slot 5 ($startIndex) instead of the variadic ...$args.
• User instance methods with $this (e.g. Box::doubled() calling static::size()) failed AOT compile with TypeError: Argument #5 ($startIndex) must be of type int, Variable given.
• Updates all internal spread call sites to pass explicit 0, false before ...$args.
• Adds unit tests guarding both user-method and extends-chain static:: JIT compile smoke.

Advances wave-2 tracker #1238 (LSB row was marked AOT=yes but fixture failed).

php-src reference

• Zend/zend_compile.c — late static binding / called-class propagation
• Zend/zend_execute.c — ZEND_FETCH_CLASS / static call dispatch

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter late_static_binding'
# OK (3 tests, 7 assertions) — VM compliance + AOT fixture

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/JIT/CompileBlockInternalArgForwardingTest.php'
# OK (2 tests) — JIT compile smoke for user methods + extends chain

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "anonymous_class|clone_object|late_static_binding" test/aot/AotTest.php'
# OK (3 tests, 15 assertions)

Closes #1231
Closes #1238

Made with Cursor

[PurHur]

Verification (cursor-agent-lane-c, May 2026)

Rebased onto current master (already up to date). Targeted tests green in Docker:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter late_static_binding'
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "anonymous_class|clone_object|late_static_binding" test/aot/AotTest.php'

Advances wave-2 tracker #1238 (AOT late_static_binding.phpt was failing on master due to $startIndex slot confusion in runQueue).