MemoryBuffer now return an error_code and returns a OwningPtr<MemoryBuffer> via an out parm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121958 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/Parser.cpp b/lib/AsmParser/Parser.cpp
index a613a83..59fb471 100644
--- a/lib/AsmParser/Parser.cpp
+++ b/lib/AsmParser/Parser.cpp
@@ -42,15 +42,14 @@
 
 Module *llvm::ParseAssemblyFile(const std::string &Filename, SMDiagnostic &Err,
                                 LLVMContext &Context) {
-  error_code ec;
-  MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), ec);
-  if (F == 0) {
+  OwningPtr<MemoryBuffer> File;
+  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), File)) {
     Err = SMDiagnostic(Filename,
                        "Could not open input file: " + ec.message());
     return 0;
   }
 
-  return ParseAssembly(F, 0, Err, Context);
+  return ParseAssembly(File.take(), 0, Err, Context);
 }
 
 Module *llvm::ParseAssemblyString(const char *AsmString, Module *M,