removed as a duplicate header search path
The commit r126167 started passing the First index into RemoveDuplicates, but
forgot to update 0 to First in the loop that looks for the duplicate. This
resulted in a bug where an -iquoted search path was incorrectly removed if you
passed in the same path into -iquote and more than one time into -isystem.
rdar://23991350
Differential Revision: https://reviews.llvm.org/D27298
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@288491 91177308-0d34-0410-b5e6-96231b3b80d8
Alex Lorenz