Fix some file headers, NFC

llvm-svn: 227826
diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index 98b0d73..6b438e00 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -1,4 +1,4 @@
-//===- llvm/unittest/IR/Metadata.cpp - Metadata unit tests ----------------===//
+//===- unittests/IR/MetadataTest.cpp - Metadata unit tests ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //