Support/FileSystem: Add status implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120870 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/PathV2.cpp

@@ -37,6 +37,8 @@ namespace {
   const char      prefered_separator = '/';
 #endif
 
+  const llvm::error_code success;
+
   StringRef find_first_component(const StringRef  &path) {
     // Look for this first component in the following order.
     // * empty (in this case we return an empty string)