Discard extra -isysroot options.  This fixes:
<rdar://problem/6253141> Parser rejection occurs when command line has more than one -isysroot switch


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56790 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed