[VectorUtils] Remove unused include. [NFC]

[fhahn]

I *think* getVectorIntrinsicIDForCall uses TargetLibraryInfo. Looks like we are still including TargetLibraryInfo.h through some other path, but we probably could also get rid of that path.

LGTM, but please add a forward declaration of TargetLibraryInfo to VectorUtils.h

[fpetrogalli]

I have added the forward declaration.

llvm/include/llvm/Analysis/VectorUtils.h

 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_ANALYSIS_VECTORUTILS_H
 #define LLVM_ANALYSIS_VECTORUTILS_H
 
 #include "llvm/ADT/MapVector.h"
 #include "llvm/Analysis/LoopAccessAnalysis.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/Support/CheckedArithmetic.h"
 
 namespace llvm {
 
 template <typename T> class ArrayRef;
 class DemandedBits;
 class GetElementPtrInst;
 template <typename InstTy> class InterleaveGroup;
 class Loop;
 class ScalarEvolution;
+class TargetLibraryInfo;
 class TargetTransformInfo;
 class Type;
 class Value;
 
 namespace Intrinsic {
 enum ID : unsigned;
 }