ntdll: Reuse old async fileio structures if possible.

[Sebastian Lackner]

This should speed up apps which heavily rely on async io stuff. Some
tests (using the kernel and ntdll wine tests) show that it is very
often possible to reuse old fileio structures.

---
 dlls/ntdll/file.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)
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