Merging r143840:

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r143840 | chandlerc | 2011-11-05 15:23:14 -0700 (Sat, 05 Nov 2011) | 4 lines

Remove a pointless member. I have no idea why I made this not a local
variable to begin with... As I'm planning to add include root
information to this object, this would have caused confusion. It didn't
even *actually* hold the include root by the time we were done with it.
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llvm-svn: 143942