Merging r271801:
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r271801 | joerg | 2016-06-04 22:03:26 +0200 (Sa, 04 Jun 2016) | 3 lines

Add PIE magic for NetBSD. Add tests for the correct flags for
non-shared, PIE and shared output mode.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_38@278388 91177308-0d34-0410-b5e6-96231b3b80d8