Return a std::unique_ptr when creating a new MemoryBuffer.

llvm-svn: 216583
diff --git a/llvm/unittests/Support/LineIteratorTest.cpp b/llvm/unittests/Support/LineIteratorTest.cpp
index 18f3fa9..2c8e143 100644
--- a/llvm/unittests/Support/LineIteratorTest.cpp
+++ b/llvm/unittests/Support/LineIteratorTest.cpp
@@ -95,19 +95,19 @@
   EXPECT_TRUE(line_iterator(*Buffer).is_at_eof());
   EXPECT_EQ(line_iterator(), line_iterator(*Buffer));
 
-  Buffer.reset(MemoryBuffer::getMemBuffer("\n\n\n"));
+  Buffer = MemoryBuffer::getMemBuffer("\n\n\n");
   EXPECT_TRUE(line_iterator(*Buffer).is_at_eof());
   EXPECT_EQ(line_iterator(), line_iterator(*Buffer));
 
-  Buffer.reset(MemoryBuffer::getMemBuffer("# foo\n"
-                                          "\n"
-                                          "# bar"));
+  Buffer = MemoryBuffer::getMemBuffer("# foo\n"
+                                      "\n"
+                                      "# bar");
   EXPECT_TRUE(line_iterator(*Buffer, '#').is_at_eof());
   EXPECT_EQ(line_iterator(), line_iterator(*Buffer, '#'));
 
-  Buffer.reset(MemoryBuffer::getMemBuffer("\n"
-                                          "# baz\n"
-                                          "\n"));
+  Buffer = MemoryBuffer::getMemBuffer("\n"
+                                      "# baz\n"
+                                      "\n");
   EXPECT_TRUE(line_iterator(*Buffer, '#').is_at_eof());
   EXPECT_EQ(line_iterator(), line_iterator(*Buffer, '#'));
 }