Support/MemoryBuffer: Replace all uses of std::string *ErrMsg with error_code &ec. And fix clients.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Object/ObjectFile.cpp b/lib/Object/ObjectFile.cpp
index 3ea39b3..2a6e086 100644
--- a/lib/Object/ObjectFile.cpp
+++ b/lib/Object/ObjectFile.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/system_error.h"
 
 using namespace llvm;
 using namespace object;
@@ -62,5 +63,6 @@
 }
 
 ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
-  return createObjectFile(MemoryBuffer::getFile(ObjectPath));
+  error_code ec;
+  return createObjectFile(MemoryBuffer::getFile(ObjectPath, ec));
 }