Don't use PathV1.h in CIndexCodeCompletion.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184940 91177308-0d34-0410-b5e6-96231b3b80d8
Quieting an MSVC warning about converting negative integer constants to unsigned types.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184941 91177308-0d34-0410-b5e6-96231b3b80d8