add Emacs tag and fix some comment error in file headers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150775 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsCodeEmitter.cpp b/lib/Target/Mips/MipsCodeEmitter.cpp
index b42220b..c06faa6 100644
--- a/lib/Target/Mips/MipsCodeEmitter.cpp
+++ b/lib/Target/Mips/MipsCodeEmitter.cpp
@@ -1,4 +1,4 @@
-//===-- Mips/MipsCodeEmitter.cpp - Convert Mips code to machine code -----===//
+//== Mips/MipsCodeEmitter.cpp - Convert Mips Code to Machine Code -*- C++ -*-=//
 //
 //                     The LLVM Compiler Infrastructure
 //