[CostModel] Mark all TTIImpls as final. NFC

In the AArch64 version this helps reduce the number of blr instruction
(indirect jumps) in from 325 to 87, and reduces the size of the object file by
4%. It seems to help make the code more efficient even if it doesn't greatly
affect compile time.

Author: davemgreen

llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h

@@ -39,7 +39,7 @@ class Type;
 class Value;
 class VectorType;
 
-class AArch64TTIImpl : public BasicTTIImplBase<AArch64TTIImpl> {
+class AArch64TTIImpl final : public BasicTTIImplBase<AArch64TTIImpl> {
   using BaseT = BasicTTIImplBase<AArch64TTIImpl>;
   using TTI = TargetTransformInfo;
 

llvm/lib/Target/ARC/ARCTargetTransformInfo.h

@@ -26,7 +26,7 @@ class ARCSubtarget;
 class ARCTargetLowering;
 class ARCTargetMachine;
 
-class ARCTTIImpl : public BasicTTIImplBase<ARCTTIImpl> {
+class ARCTTIImpl final : public BasicTTIImplBase<ARCTTIImpl> {
   using BaseT = BasicTTIImplBase<ARCTTIImpl>;
   friend BaseT;
 

llvm/lib/Target/ARM/ARMTargetTransformInfo.h

@@ -54,7 +54,7 @@ namespace TPLoop {
 enum MemTransfer { ForceDisabled = 0, ForceEnabled, Allow };
 }
 
-class ARMTTIImpl : public BasicTTIImplBase<ARMTTIImpl> {
+class ARMTTIImpl final : public BasicTTIImplBase<ARMTTIImpl> {
   using BaseT = BasicTTIImplBase<ARMTTIImpl>;
   using TTI = TargetTransformInfo;
 

llvm/lib/Target/BPF/BPFTargetTransformInfo.h

@@ -21,7 +21,7 @@
 #include "llvm/Transforms/Utils/ScalarEvolutionExpander.h"
 
 namespace llvm {
-class BPFTTIImpl : public BasicTTIImplBase<BPFTTIImpl> {
+class BPFTTIImpl final : public BasicTTIImplBase<BPFTTIImpl> {
   typedef BasicTTIImplBase<BPFTTIImpl> BaseT;
   typedef TargetTransformInfo TTI;
   friend BaseT;

llvm/lib/Target/DirectX/DirectXTargetTransformInfo.h

@@ -17,7 +17,7 @@
 #include "llvm/IR/Function.h"
 
 namespace llvm {
-class DirectXTTIImpl : public BasicTTIImplBase<DirectXTTIImpl> {
+class DirectXTTIImpl final : public BasicTTIImplBase<DirectXTTIImpl> {
   using BaseT = BasicTTIImplBase<DirectXTTIImpl>;
   using TTI = TargetTransformInfo;
 

llvm/lib/Target/Hexagon/HexagonTargetTransformInfo.h

@@ -30,7 +30,7 @@ class ScalarEvolution;
 class User;
 class Value;
 
-class HexagonTTIImpl : public BasicTTIImplBase<HexagonTTIImpl> {
+class HexagonTTIImpl final : public BasicTTIImplBase<HexagonTTIImpl> {
   using BaseT = BasicTTIImplBase<HexagonTTIImpl>;
   using TTI = TargetTransformInfo;
 

llvm/lib/Target/Lanai/LanaiTargetTransformInfo.h

@@ -25,7 +25,7 @@
 #include "llvm/Support/MathExtras.h"
 
 namespace llvm {
-class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
+class LanaiTTIImpl final : public BasicTTIImplBase<LanaiTTIImpl> {
   typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
   typedef TargetTransformInfo TTI;
   friend BaseT;

llvm/lib/Target/Mips/MipsTargetTransformInfo.h

@@ -15,7 +15,7 @@
 
 namespace llvm {
 
-class MipsTTIImpl : public BasicTTIImplBase<MipsTTIImpl> {
+class MipsTTIImpl final : public BasicTTIImplBase<MipsTTIImpl> {
   using BaseT = BasicTTIImplBase<MipsTTIImpl>;
   using TTI = TargetTransformInfo;
 

llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h

@@ -26,7 +26,7 @@
 
 namespace llvm {
 
-class NVPTXTTIImpl : public BasicTTIImplBase<NVPTXTTIImpl> {
+class NVPTXTTIImpl final : public BasicTTIImplBase<NVPTXTTIImpl> {
   typedef BasicTTIImplBase<NVPTXTTIImpl> BaseT;
   typedef TargetTransformInfo TTI;
   friend BaseT;

llvm/lib/Target/PowerPC/PPCTargetTransformInfo.h

@@ -24,7 +24,7 @@
 
 namespace llvm {
 
-class PPCTTIImpl : public BasicTTIImplBase<PPCTTIImpl> {
+class PPCTTIImpl final : public BasicTTIImplBase<PPCTTIImpl> {
   typedef BasicTTIImplBase<PPCTTIImpl> BaseT;
   typedef TargetTransformInfo TTI;
   friend BaseT;