add Emacs tag and fix some comment error in file headers

llvm-svn: 150775
diff --git a/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp b/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
index 243632b..71674d6 100644
--- a/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
+++ b/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
@@ -1,4 +1,4 @@
-//===-- MipsTargetInfo.cpp - Mips Target Implementation -------------------===//
+//===-- MipsTargetInfo.cpp - Mips Target Implementation --------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //