Fix #includes of i*.h => Instructions.h as per PR403.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15337 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/BreakCriticalEdges.cpp

@@ -21,7 +21,6 @@
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Function.h"
 #include "llvm/Instructions.h"
-#include "llvm/iPHINode.h"
 #include "llvm/Support/CFG.h"
 #include "Support/Statistic.h"
 using namespace llvm;