[VFS] Replace TimeValue usage with std::chrono

Summary: NFCI

Reviewers: benlangmuir, zturner

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25948

llvm-svn: 286356
diff --git a/clang/lib/Basic/FileSystemStatCache.cpp b/clang/lib/Basic/FileSystemStatCache.cpp
index 33b8676..799df1d 100644
--- a/clang/lib/Basic/FileSystemStatCache.cpp
+++ b/clang/lib/Basic/FileSystemStatCache.cpp
@@ -23,7 +23,7 @@
                                  FileData &Data) {
   Data.Name = Status.getName();
   Data.Size = Status.getSize();
-  Data.ModTime = Status.getLastModificationTime().toEpochTime();
+  Data.ModTime = llvm::sys::toTimeT(Status.getLastModificationTime());
   Data.UniqueID = Status.getUniqueID();
   Data.IsDirectory = Status.isDirectory();
   Data.IsNamedPipe = Status.getType() == llvm::sys::fs::file_type::fifo_file;