Remove usages of deprecated std::unary_function and std::binary_function.

These are removed in C++17. We still have some users of
unary_function::argument_type, so just spell that typedef out. No
functionality change intended.

Note that many of the argument types are actually wrong :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313287 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/STLExtras.h

@@ -56,8 +56,8 @@ using ValueOfRange = typename std::remove_reference<decltype(
 //     Extra additions to <functional>
 //===----------------------------------------------------------------------===//
 
-template<class Ty>
-struct identity : public std::unary_function<Ty, Ty> {
+template <class Ty> struct identity {
+  using argument_type = Ty;
   Ty &operator()(Ty &self) const {
     return self;
   }
@@ -66,15 +66,13 @@ struct identity : public std::unary_function<Ty, Ty> {
   }
 };
 
-template<class Ty>
-struct less_ptr : public std::binary_function<Ty, Ty, bool> {
+template <class Ty> struct less_ptr {
   bool operator()(const Ty* left, const Ty* right) const {
     return *left < *right;
   }
 };
 
-template<class Ty>
-struct greater_ptr : public std::binary_function<Ty, Ty, bool> {
+template <class Ty> struct greater_ptr {
   bool operator()(const Ty* left, const Ty* right) const {
     return *right < *left;
   }

include/llvm/CodeGen/LatencyPriorityQueue.h

@@ -22,7 +22,7 @@ namespace llvm {
   class LatencyPriorityQueue;
 
   /// Sorting functions for the Available queue.
-  struct latency_sort : public std::binary_function<SUnit*, SUnit*, bool> {
+  struct latency_sort {
     LatencyPriorityQueue *PQ;
     explicit latency_sort(LatencyPriorityQueue *pq) : PQ(pq) {}
 

include/llvm/CodeGen/MachineBasicBlock.h

@@ -762,8 +762,8 @@ private:
 raw_ostream& operator<<(raw_ostream &OS, const MachineBasicBlock &MBB);
 
 // This is useful when building IndexedMaps keyed on basic block pointers.
-struct MBB2NumberFunctor :
-  public std::unary_function<const MachineBasicBlock*, unsigned> {
+struct MBB2NumberFunctor {
+  using argument_type = const MachineBasicBlock *;
   unsigned operator()(const MachineBasicBlock *MBB) const {
     return MBB->getNumber();
   }

include/llvm/CodeGen/ResourcePriorityQueue.h

@@ -28,7 +28,7 @@ namespace llvm {
   class ResourcePriorityQueue;
 
   /// Sorting functions for the Available queue.
-  struct resource_sort : public std::binary_function<SUnit*, SUnit*, bool> {
+  struct resource_sort {
     ResourcePriorityQueue *PQ;
     explicit resource_sort(ResourcePriorityQueue *pq) : PQ(pq) {}
 

include/llvm/Target/TargetRegisterInfo.h

@@ -1124,7 +1124,8 @@ public:
 };
 
 // This is useful when building IndexedMaps keyed on virtual registers
-struct VirtReg2IndexFunctor : public std::unary_function<unsigned, unsigned> {
+struct VirtReg2IndexFunctor {
+  using argument_type = unsigned;
   unsigned operator()(unsigned Reg) const {
     return TargetRegisterInfo::virtReg2Index(Reg);
   }

lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp

@@ -1575,7 +1575,7 @@ void ScheduleDAGRRList::ListScheduleBottomUp() {
 namespace {
 class RegReductionPQBase;
 
-struct queue_sort : public std::binary_function<SUnit*, SUnit*, bool> {
+struct queue_sort {
   bool isReady(SUnit* SU, unsigned CurCycle) const { return true; }
 };
 

utils/TableGen/SequenceToOffsetTable.h

@@ -37,7 +37,7 @@ class SequenceToOffsetTable {
 
   // Define a comparator for SeqT that sorts a suffix immediately before a
   // sequence with that suffix.
-  struct SeqLess : public std::binary_function<SeqT, SeqT, bool> {
+  struct SeqLess {
     Less L;
     bool operator()(const SeqT &A, const SeqT &B) const {
       return std::lexicographical_compare(A.rbegin(), A.rend(),