php-in-php: route bound-method FCC through VmBoundMethodCallable (#10185)

[PurHur]

Summary

• Move [object, method] first-class callable resolution from lib/JIT/BoundMethodCallableHelper.php (~381 lines) into VM SSOT lib/VM/VmBoundMethodCallable.php
• JIT helper shrinks to thin trampoline (~56 lines)
• VmFromCallable calls VmBoundMethodCallable directly (no JIT-layer indirection)

Closes #10185

php-src reference

• Zend/zend_compile.c — zend_compile_callable
• Zend/zend_execute.c — ZEND_INIT_FCALL bound method path

Shrink

File	Before	After
lib/JIT/BoundMethodCallableHelper.php	381 lines	56 lines trampoline
lib/VM/VmBoundMethodCallable.php	—	387 lines PHP SSOT

Test plan

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/BoundMethodCallableHelperRuntimeShrinkTest.php
vendor/bin/phpunit test/unit/FromCallableRuntimeShrinkTest.php
php bin/jit.php -r "
class C { public function m(): int { return 1; } }
\$f = [new C, \"m\"];
echo \$f(), \"\\n\";
"
php script/bootstrap-inventory.php --check
'

Output

OK (3 tests, 13 assertions)   # BoundMethodCallableHelperRuntimeShrinkTest
OK (2 tests, 10 assertions)   # FromCallableRuntimeShrinkTest
1                             # JIT [obj,method]() FCC repro

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