[PurHur]

Summary

• Restore use PHPCompiler\VM\InternalStrictArg; in VmFilestatArg.php after Stdlib: coerce null path args in filestat builtins (#17006) #17152 accidentally removed it while leaving isCallerStrict() calls in parseFileModeArgForFrame() / requireIntOrStringArgForFrame().
• Fixes fatal Class "PHPCompiler\ext\standard\InternalStrictArg" not found on chmod($f, '0644') and restores Zend string-mode coercion ('0644' → mode 204).

Root cause commit: 710cebce3 (#17152).

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_chmod_octal_string.php'
# ok

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_chmod_string_mode.php'
# int_mode=644 str_mode=204

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter "chmod_string_octal_mode|chmod_mode_string_weak|chmod_string_mode_typeerror"'
# OK (6 tests, 6 assertions)

Closes #17155

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