Merge 82194 from mainline.
don't stick an uninitialized 'stat' buf into the stat cache, fill it
with zeros.  This avoids a GCC warning (PR5000)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_26@82195 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Basic/FileManager.cpp

diff --git a/lib/Basic/FileManager.cpp b/lib/Basic/FileManager.cpp
index 98979d5..448063f 100644
--- a/lib/Basic/FileManager.cpp
+++ b/lib/Basic/FileManager.cpp
@@ -293,6 +293,7 @@
   if (result != 0) { 
     // Cache failed 'stat' results.
     struct stat empty;
+    memset(&empty, 0, sizeof(empty));
     StatCalls[path] = StatResult(result, empty);
   }
   else if (!S_ISDIR(buf->st_mode) || llvm::sys::Path(path).isAbsolute()) {