There is no std::errc::success, remove the llvm one.

llvm-svn: 209960
diff --git a/llvm/lib/Object/Error.cpp b/llvm/lib/Object/Error.cpp
index 8e50869..6f72849 100644
--- a/llvm/lib/Object/Error.cpp
+++ b/llvm/lib/Object/Error.cpp
@@ -49,7 +49,7 @@
 
 error_condition _object_error_category::default_error_condition(int ev) const {
   if (ev == object_error::success)
-    return errc::success;
+    return error_condition();
   return errc::invalid_argument;
 }
 
diff --git a/llvm/lib/ProfileData/InstrProf.cpp b/llvm/lib/ProfileData/InstrProf.cpp
index de2b13d..60a8efb 100644
--- a/llvm/lib/ProfileData/InstrProf.cpp
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@@ -54,7 +54,7 @@
   }
   error_condition default_error_condition(int EV) const override {
     if (EV == instrprof_error::success)
-      return errc::success;
+      return error_condition();
     return errc::invalid_argument;
   }
 };
diff --git a/llvm/lib/Support/LockFileManager.cpp b/llvm/lib/Support/LockFileManager.cpp
index 9b4bfbe..05e75cf 100644
--- a/llvm/lib/Support/LockFileManager.cpp
+++ b/llvm/lib/Support/LockFileManager.cpp
@@ -124,7 +124,7 @@
     // Create a link from the lock file name. If this succeeds, we're done.
     error_code EC =
         sys::fs::create_link(UniqueLockFileName.str(), LockFileName.str());
-    if (EC == errc::success)
+    if (!EC)
       return;
 
     if (EC != errc::file_exists) {
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
index 1225a9c..f4c6cdf 100644
--- a/llvm/lib/Support/Unix/Program.inc
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -427,12 +427,12 @@
 
 error_code sys::ChangeStdinToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
-  return make_error_code(errc::success);
+  return error_code();
 }
 
 error_code sys::ChangeStdoutToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
-  return make_error_code(errc::success);
+  return error_code();
 }
 
 bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {