Fix code quality issues.

Author: maarquitos14

llvm/include/llvm/TextAPI/SymbolSet.h

@@ -92,6 +92,8 @@ class SymbolSet {
 
 public:
   SymbolSet() = default;
+  SymbolSet(const SymbolSet &other) = delete;
+  SymbolSet &operator=(const SymbolSet &other) = delete;
   LLVM_ABI ~SymbolSet();
   LLVM_ABI Symbol *addGlobal(EncodeKind Kind, StringRef Name, SymbolFlags Flags,
                              const Target &Targ);

llvm/lib/CAS/InMemoryCAS.cpp

@@ -57,6 +57,9 @@ class InMemoryObject {
   InMemoryObject() = delete;
   InMemoryObject(InMemoryObject &&) = delete;
   InMemoryObject(const InMemoryObject &) = delete;
+  InMemoryObject &operator=(const InMemoryObject &) = delete;
+  InMemoryObject &operator=(InMemoryObject &&) = delete;
+  virtual ~InMemoryObject() = default;
 
 protected:
   InMemoryObject(Kind K, const InMemoryIndexValueT &I) : IndexAndKind(&I, K) {}