Merging r143916:

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r143916 | chandlerc | 2011-11-07 01:01:17 -0800 (Mon, 07 Nov 2011) | 4 lines

Fix Linux libc++ usage. Somehow this slipped through during the port.

Test cases for this and all the rest of the port are still in the works,
but will wait for a fixed computer and post 3.0 merging...
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llvm-svn: 143955