VectorUtils.h - reduce unnecessary includes. NFC.

Replace TargetLibraryInfo.h include with forward declaration and fix implicit dependencies.

Reduce SmallSet.h include to SmallVector.h include.

include/llvm/Analysis/VectorUtils.h

@@ -14,12 +14,12 @@
 #define LLVM_ANALYSIS_VECTORUTILS_H
 
 #include "llvm/ADT/MapVector.h"
-#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/Analysis/LoopAccessAnalysis.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Support/CheckedArithmetic.h"
 
 namespace llvm {
+class TargetLibraryInfo;
 
 /// Describes the type of Parameters
 enum class VFParamKind {

lib/Target/PowerPC/PPCTargetTransformInfo.cpp

@@ -8,6 +8,7 @@
 
 #include "PPCTargetTransformInfo.h"
 #include "llvm/Analysis/CodeMetrics.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/CodeGen/BasicTTIImpl.h"
 #include "llvm/CodeGen/CostTable.h"
@@ -18,6 +19,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Transforms/InstCombine/InstCombiner.h"
 #include "llvm/Transforms/Utils/Local.h"
+
 using namespace llvm;
 
 #define DEBUG_TYPE "ppctti"

lib/Transforms/Vectorize/LoopVectorizationLegality.cpp

@@ -13,9 +13,11 @@
 // pass. It should be easy to create an analysis pass around it if there
 // is a need (but D45420 needs to happen first).
 //
+
 #include "llvm/Transforms/Vectorize/LoopVectorizationLegality.h"
 #include "llvm/Analysis/Loads.h"
 #include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/Analysis/VectorUtils.h"
 #include "llvm/IR/IntrinsicInst.h"