[NFC][clang] Fix static analyzer concerns

[Fznamznon]

Summary

A bunch of classes in APValue free resources in the destructor but don't
have user-written copy c'tor or assignment operator, so copying them using
default ones can cause double free.

[aaron.ballman]

LGTM!

clang/include/clang/AST/APValue.h

struct ComplexAPFloat {
     APFloat Real, Imag;
     ComplexAPFloat() : Real(0.0), Imag(0.0) {}
   };
   struct LV;
   struct Vec {
     APValue *Elts = nullptr;
     unsigned NumElts = 0;
     Vec() = default;
+    Vec(const Vec &) = delete;
+    Vec &operator=(const Vec &) = delete;
     ~Vec() { delete[] Elts; }
   };
   struct Arr {
     APValue *Elts;
     unsigned NumElts, ArrSize;
     Arr(unsigned NumElts, unsigned ArrSize);
+    Arr(const Arr &) = delete;
+    Arr &operator=(const Arr &) = delete;
     ~Arr();
   };
   struct StructData {
     APValue *Elts;
     unsigned NumBases;
     unsigned NumFields;
     StructData(unsigned NumBases, unsigned NumFields);
+    StructData(const StructData &) = delete;
+    StructData &operator=(const StructData &) = delete;
     ~StructData();
   };
   struct UnionData {
     const FieldDecl *Field;
     APValue *Value;
     UnionData();
+    UnionData(const UnionData &) = delete;
+    UnionData &operator=(const UnionData &) = delete;
     ~UnionData();
   };
   struct AddrLabelDiffData {
     const AddrLabelExpr* LHSExpr;
     const AddrLabelExpr* RHSExpr;
   };
   struct MemberPointerData;