[NFC][clang] Fix static analyzer concerns

[Fznamznon]

Summary

IdDeclInfoMap frees resources in the destructor but doesn't
have user-written copy c'tor or assignment operator, so copying it using
default ones can cause double free.

[aaron.ballman]

LGTM!

clang/lib/Sema/IdentifierResolver.cpp

public:
   ~IdDeclInfoMap() {
     IdDeclInfoPool *Cur = CurPool;
     while (IdDeclInfoPool *P = Cur) {
       Cur = Cur->Next;
       delete P;
     }
   }
 
+  IdDeclInfoMap(const IdDeclInfoMap &) = delete;
+  IdDeclInfoMap &operator=(const IdDeclInfoMap &) = delete;
+
   /// Returns the IdDeclInfo associated to the DeclarationName.
   /// It creates a new IdDeclInfo if one was not created before for this id.
   IdDeclInfo &operator[](DeclarationName Name);
 };
 
 //===----------------------------------------------------------------------===//
 // IdDeclInfo Implementation
 //===----------------------------------------------------------------------===//