don't stick an uninitialized 'stat' buf into the stat cache, fill it

with zeros.  This avoids a GCC warning (PR5000)

llvm-svn: 82194

clang/lib/Basic/FileManager.cpp

@@ -295,6 +295,7 @@ int MemorizeStatCalls::stat(const char *path, struct stat *buf) {
   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()) {