XFS: Case-insensitive support - ASCII only

This patch seems to resolve all issues I had with CI support with the
dentry cache. 

My solution for negative dentries was to not call d_add() when the 
inode was not found. I had to fix up the create so it would call
d_rehash if the entry was unhashed.

I've also applied the other previous suggestions and cleanups.

The only outstanding problem is case-preserving rename on a CI
filesystem. I will write a patch for passing flags down to the 
fs-specific lookup once the nameidata patch mentioned by 
Christoph has been removed.

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