Replace all uses of PathV1::getLast with PathV2::filename.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122117 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexUSRs.cpp b/tools/libclang/CIndexUSRs.cpp
index 8a1d423..5861ee6 100644
--- a/tools/libclang/CIndexUSRs.cpp
+++ b/tools/libclang/CIndexUSRs.cpp
@@ -488,8 +488,7 @@
   const std::pair<FileID, unsigned> &Decomposed = SM.getDecomposedLoc(L);
   const FileEntry *FE = SM.getFileEntryForID(Decomposed.first);
   if (FE) {
-    llvm::sys::Path P(FE->getName());
-    Out << P.getLast();
+    Out << llvm::sys::path::filename(FE->getName());
   }
   else {
     // This case really isn't interesting.