Eliminate duplicate or unneccesary #include's

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2397 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/GlobalDCE.cpp

@@ -9,9 +9,7 @@
 #include "llvm/Analysis/CallGraph.h"
 #include "llvm/Module.h"
 #include "llvm/Function.h"
-#include "llvm/Pass.h"
 #include "Support/DepthFirstIterator.h"
-#include <set>
 
 static bool RemoveUnreachableFunctions(Module *M, CallGraph &CallGraph) {
   // Calculate which functions are reachable from the external functions in the