Fix copy and paste mistake in header comment, NFC.

llvm-svn: 295763
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 304288d..913a2ea 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -1,4 +1,4 @@
-//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
+//===---- CGObjC.cpp - Emit LLVM Code for Objective-C ---------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //