[MPICH] slow IOR when using fileview

[Weikuan Yu]

I am very sorry! The last patch was created by mistake with *.bak file in my 
directory. Attached is a new one with them cleaned up.

Sorry again!

--Weikuan

Weikuan Yu wrote:
> Attached is an updated patch for the data sieving issue over Cray XT. 
> This has added a condition checking to ensure filetype exists before 
> checking a range of it. It compiles well (should work fine) on linux 
> platforms.
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