In kernel32/tests/loader.c, child_process will try to write to stdout after calling LdrShutdownProcess. LdrShutdownProcess calls DLL_PROCESS_DETACH on msvcrt, which calls msvcrt_free_io, which frees the ioinfo blocks. So to prevent use after free in this case, we don't free them.
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Supersedes !8273
-- v4: msvcrt: Don't release io memory in msvcrt_free_io during shutdown.