Pass a std::unique_ptr<MemoryBuffer>& to getLazyBitcodeModule.

By taking a reference we can do the ownership transfer in one place instead of
expecting every caller to do it.

llvm-svn: 216492

llvm/unittests/Bitcode/BitReaderTest.cpp

@@ -51,7 +51,8 @@ static std::unique_ptr<Module> getLazyModuleFromAssembly(LLVMContext &Context,
                                                          SmallString<1024> &Mem,
                                                          const char *Assembly) {
   writeModuleToBuffer(parseAssembly(Assembly), Mem);
-  MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(Mem.str(), "test", false);
+  std::unique_ptr<MemoryBuffer> Buffer(
+      MemoryBuffer::getMemBuffer(Mem.str(), "test", false));
   ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context);
   return std::unique_ptr<Module>(ModuleOrErr.get());
 }