php-in-php: Bz2StreamRuntime NestedJIT → JitVmHelperLink::ensureCompiled (#22416)

[PurHur]

Summary

• Replace hand-rolled NestedJitCompileScope::run / parseAndCompile / new JIT() in Bz2StreamRuntime with JitVmHelperLink::ensureCompiled + lookupCompiled (peer php-in-php: SysGetloadavgRuntime NestedJIT → JitVmHelperLink::ensureCompiled (#1492) #22399 SysGetloadavgRuntime).
• Keep NestedJitCompileScope::isActive() early-return in implement() (skip bridge emission during nested helper compile).
• Net −19 lines in lib/JIT/Builtin/Bz2StreamRuntime.php (10+/29−); no new C. Inventory warnings −1 (new JIT removed).
• Closes php-in-php: Bz2StreamRuntime NestedJIT → JitVmHelperLink::ensureCompiled (#1492) #22416

Verification

$ ./script/phpunit.sh test/unit/Bz2StreamRuntimeShrinkTest.php
OK (2 tests, 10 assertions)

$ ./script/phpunit.sh test/unit/Bz2RuntimeShrinkTest.php test/unit/Bz2StreamRuntimeShrinkTest.php
OK (4 tests, 23 assertions)

$ make bootstrap-selfhost-vm-driver-execute-probe
bootstrap-selfhost-vm-driver-execute-probe: OK

$ php script/bootstrap-inventory.php --check
OK 6432/6432

$ php script/check-selfhost-spine-coverage-sync.php
check-selfhost-spine-coverage-sync: OK (spine covers all 6432 inventory files)

Test plan

• Shrink unit test guards JitVmHelperLink::ensureCompiled, no hand-rolled NestedJIT compile
• VM driver execute probe green
• Inventory/spine sync green after construct-flag refresh

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