Remove 'using std::errro_code' from lib.

llvm-svn: 210871
diff --git a/llvm/lib/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index 5dfe9a6..197b6cb 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -41,7 +41,6 @@
 #include <system_error>
 
 using namespace llvm;
-using std::error_code;
 
 #define DEBUG_TYPE "ir"
 
@@ -2602,7 +2601,7 @@
     char **OutMessage) {
 
   std::unique_ptr<MemoryBuffer> MB;
-  error_code ec;
+  std::error_code ec;
   if (!(ec = MemoryBuffer::getFile(Path, MB))) {
     *OutMemBuf = wrap(MB.release());
     return 0;
@@ -2615,7 +2614,7 @@
 LLVMBool LLVMCreateMemoryBufferWithSTDIN(LLVMMemoryBufferRef *OutMemBuf,
                                          char **OutMessage) {
   std::unique_ptr<MemoryBuffer> MB;
-  error_code ec;
+  std::error_code ec;
   if (!(ec = MemoryBuffer::getSTDIN(MB))) {
     *OutMemBuf = wrap(MB.release());
     return 0;
diff --git a/llvm/lib/IR/GCOV.cpp b/llvm/lib/IR/GCOV.cpp
index c8dc951..b4c7977 100644
--- a/llvm/lib/IR/GCOV.cpp
+++ b/llvm/lib/IR/GCOV.cpp
@@ -22,7 +22,6 @@
 #include <algorithm>
 #include <system_error>
 using namespace llvm;
-using std::error_code;
 
 //===----------------------------------------------------------------------===//
 // GCOVFile implementation.
@@ -439,7 +438,7 @@
   StringRef Remaining;
 public:
   LineConsumer(StringRef Filename) {
-    if (error_code EC = MemoryBuffer::getFileOrSTDIN(Filename, Buffer)) {
+    if (std::error_code EC = MemoryBuffer::getFileOrSTDIN(Filename, Buffer)) {
       errs() << Filename << ": " << EC.message() << "\n";
       Remaining = "";
     } else
diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index bc72a67..6a5b386 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -28,7 +28,6 @@
 #include <cstdarg>
 #include <cstdlib>
 using namespace llvm;
-using std::error_code;
 
 //===----------------------------------------------------------------------===//
 // Methods to implement the globals and functions lists.
@@ -382,7 +381,7 @@
   if (!Materializer)
     return false;
 
-  error_code EC = Materializer->Materialize(GV);
+  std::error_code EC = Materializer->Materialize(GV);
   if (!EC)
     return false;
   if (ErrInfo)
@@ -395,18 +394,18 @@
     return Materializer->Dematerialize(GV);
 }
 
-error_code Module::materializeAll() {
+std::error_code Module::materializeAll() {
   if (!Materializer)
-    return error_code();
+    return std::error_code();
   return Materializer->MaterializeModule(this);
 }
 
-error_code Module::materializeAllPermanently() {
-  if (error_code EC = materializeAll())
+std::error_code Module::materializeAllPermanently() {
+  if (std::error_code EC = materializeAll())
     return EC;
 
   Materializer.reset();
-  return error_code();
+  return std::error_code();
 }
 
 //===----------------------------------------------------------------------===//