SimplifyLibCalls - remove unnecessary header and forward declaration. NFC.

We include TargetLibraryInfo.h so don't need to forward declare it, and we don't need to include TargetLibraryInfo.h in SimplifyLibCalls.cpp as well.

llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h

@@ -24,7 +24,6 @@ class CallInst;
 class DataLayout;
 class Instruction;
 class IRBuilderBase;
-class TargetLibraryInfo;
 class Function;
 class OptimizationRemarkEmitter;
 class BlockFrequencyInfo;

llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp

@@ -20,7 +20,6 @@
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/OptimizationRemarkEmitter.h"
 #include "llvm/Analysis/ProfileSummaryInfo.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/Analysis/CaptureTracking.h"