-Wdeprecated-clean: Fix cases of violating the rule of 5 in ways that are deprecated in C++11

Remove some unnecessary explicit special members in Hexagon that, once
removed, allow the other implicit special members to be used without
depending on deprecated features.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243825 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Hexagon/BitTracker.h

@@ -77,7 +77,6 @@ private:
 // Abstraction of a reference to bit at position Pos from a register Reg.
 struct BitTracker::BitRef {
   BitRef(unsigned R = 0, uint16_t P = 0) : Reg(R), Pos(P) {}
-  BitRef(const BitRef &BR) : Reg(BR.Reg), Pos(BR.Pos) {}
   bool operator== (const BitRef &BR) const {
     // If Reg is 0, disregard Pos.
     return Reg == BR.Reg && (Reg == 0 || Pos == BR.Pos);
@@ -144,7 +143,6 @@ struct BitTracker::BitValue {
 
   BitValue(ValueType T = Top) : Type(T) {}
   BitValue(bool B) : Type(B ? One : Zero) {}
-  BitValue(const BitValue &V) : Type(V.Type), RefI(V.RefI) {}
   BitValue(unsigned Reg, uint16_t Pos) : Type(Ref), RefI(Reg, Pos) {}
 
   bool operator== (const BitValue &V) const {
@@ -277,11 +275,6 @@ struct BitTracker::RegisterCell {
     return !operator==(RC);
   }
 
-  const RegisterCell &operator=(const RegisterCell &RC) {
-    Bits = RC.Bits;
-    return *this;
-  }
-
   // Generate a "ref" cell for the corresponding register. In the resulting
   // cell each bit will be described as being the same as the corresponding
   // bit in register Reg (i.e. the cell is "defined" by register Reg).

lib/Target/Hexagon/HexagonGenInsert.cpp

@@ -77,9 +77,8 @@ namespace {
 namespace {
   // Set of virtual registers, based on BitVector.
   struct RegisterSet : private BitVector {
-    RegisterSet() : BitVector() {}
+    RegisterSet() = default;
     explicit RegisterSet(unsigned s, bool t = false) : BitVector(s, t) {}
-    RegisterSet(const RegisterSet &RS) : BitVector(RS) {}
 
     using BitVector::clear;