Remove emacs mode markers from .cpp files. NFC

.cpp files are unambiguously C++, you only need the mode markers on .h files.

llvm-svn: 267353
diff --git a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
index d9d2a8a..5f93768 100644
--- a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -1,4 +1,4 @@
-//===- ScalarEvolutionExpander.cpp - Scalar Evolution Analysis --*- C++ -*-===//
+//===- ScalarEvolutionExpander.cpp - Scalar Evolution Analysis ------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //