Remove vestigal bits of MC from the mangler. It no longer uses this, and

having the include could cause weird layering problems between the IR
and MC libraries.

llvm-svn: 198796

llvm/include/llvm/IR/Mangler.h

@@ -20,7 +20,6 @@ namespace llvm {
 
 class DataLayout;
 class GlobalValue;
-class MCContext;
 template <typename T> class SmallVectorImpl;
 class Twine;
 

llvm/lib/IR/Mangler.cpp

@@ -17,7 +17,6 @@
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Function.h"
-#include "llvm/MC/MCContext.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;