Index: include/llvm/Support/Error.h
===================================================================
--- include/llvm/Support/Error.h
+++ include/llvm/Support/Error.h
@@ -1176,7 +1176,7 @@
 /// show more detailed information to the user.
 class FileError final : public ErrorInfo<FileError> {
 
-  friend Error createFileError(std::string, Error);
+  friend Error createFileError(const Twine &, Error);
 
 public:
   void log(raw_ostream &OS) const override {
@@ -1193,15 +1193,15 @@
   static char ID;
 
 private:
-  FileError(std::string F, std::unique_ptr<ErrorInfoBase> E) {
+  FileError(const Twine &F, std::unique_ptr<ErrorInfoBase> E) {
     assert(E && "Cannot create FileError from Error success value.");
     assert(!F.empty() &&
            "The file name provided to FileError must not be empty.");
-    FileName = F;
+    FileName = F.str();
     Err = std::move(E);
   }
 
-  static Error build(std::string F, Error E) {
+  static Error build(const Twine &F, Error E) {
     return Error(std::unique_ptr<FileError>(new FileError(F, E.takePayload())));
   }
 
@@ -1211,10 +1211,16 @@
 
 /// Concatenate a source file path and/or name with an Error. The resulting
 /// Error is unchecked.
-inline Error createFileError(std::string F, Error E) {
+inline Error createFileError(const Twine &F, Error E) {
   return FileError::build(F, std::move(E));
 }
 
+/// Concatenate a source file path and/or name with an Error. Also build
+/// Error object from std::error_code.
+inline Error createFileError(const Twine &F, std::error_code EC) {
+  return createFileError(F, make_error<StringError>(EC));
+}
+
 Error createFileError(std::string F, ErrorSuccess) = delete;
 
 /// Helper for check-and-exit error handling.
Index: tools/llvm-objcopy/CopyConfig.cpp
===================================================================
--- tools/llvm-objcopy/CopyConfig.cpp
+++ tools/llvm-objcopy/CopyConfig.cpp
@@ -263,7 +263,7 @@
   SmallVector<StringRef, 16> Lines;
   auto BufOrErr = MemoryBuffer::getFile(Filename);
   if (!BufOrErr)
-    return createError(Filename, BufOrErr.getError());
+    return createFileError(Filename, BufOrErr.getError());
 
   BufOrErr.get()->getBuffer().split(Lines, '\n');
   size_t NumLines = Lines.size();
Index: tools/llvm-objcopy/llvm-objcopy.h
===================================================================
--- tools/llvm-objcopy/llvm-objcopy.h
+++ tools/llvm-objcopy/llvm-objcopy.h
@@ -18,8 +18,6 @@
 namespace llvm {
 namespace objcopy {
 
-Error createError(StringRef File, std::error_code EC);
-
 LLVM_ATTRIBUTE_NORETURN extern void error(Twine Message);
 LLVM_ATTRIBUTE_NORETURN extern void error(Error E);
 LLVM_ATTRIBUTE_NORETURN extern void reportError(StringRef File, Error E);
Index: tools/llvm-objcopy/llvm-objcopy.cpp
===================================================================
--- tools/llvm-objcopy/llvm-objcopy.cpp
+++ tools/llvm-objcopy/llvm-objcopy.cpp
@@ -52,11 +52,6 @@
 // The name this program was invoked as.
 StringRef ToolName;
 
-Error createError(StringRef File, std::error_code EC) {
-  assert(EC);  
-  return createFileError(File, make_error<StringError>(EC));
-}
-
 LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
   WithColor::error(errs(), ToolName) << Message << ".\n";
   errs().flush();
@@ -74,7 +69,8 @@
 }
 
 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
-  error(createError(File, EC));
+  assert(EC);
+  error(createFileError(File, EC));
 }
 
 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {