Revert r194865 and r194874.

This change is incorrect. If you delete virtual destructor of both a base class
and a subclass, then the following code:
  Base *foo = new Child();
  delete foo;
will not cause the destructor for members of Child class. As a result, I observe
plently of memory leaks. Notable examples I investigated are:
ObjectBuffer and ObjectBufferStream, AttributeImpl and StringSAttributeImpl.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194997 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/TGValueTypes.cpp

@@ -35,11 +35,9 @@ public:
   }
   Type(TypeKind K) : Kind(K) {}
   virtual unsigned getSizeInBits() const = 0;
-  virtual ~Type();
+  virtual ~Type() {}
 };
 
-Type::~Type() {}
-
 }
 
 class ExtendedIntegerType : public Type {
@@ -47,11 +45,10 @@ class ExtendedIntegerType : public Type {
 public:
   explicit ExtendedIntegerType(unsigned bits)
     : Type(TK_ExtendedIntegerType), BitWidth(bits) {}
-  virtual ~ExtendedIntegerType();
   static bool classof(const Type *T) {
     return T->getKind() == TK_ExtendedIntegerType;
   }
-  virtual unsigned getSizeInBits() const {
+  unsigned getSizeInBits() const {
     return getBitWidth();
   }
   unsigned getBitWidth() const {
@@ -59,20 +56,16 @@ public:
   }
 };
 
-ExtendedIntegerType::~ExtendedIntegerType() {}
-
-
 class ExtendedVectorType : public Type {
   EVT ElementType;
   unsigned NumElements;
 public:
   ExtendedVectorType(EVT elty, unsigned num)
     : Type(TK_ExtendedVectorType), ElementType(elty), NumElements(num) {}
-  virtual ~ExtendedVectorType();
   static bool classof(const Type *T) {
     return T->getKind() == TK_ExtendedVectorType;
   }
-  virtual unsigned getSizeInBits() const {
+  unsigned getSizeInBits() const {
     return getNumElements() * getElementType().getSizeInBits();
   }
   EVT getElementType() const {
@@ -83,9 +76,6 @@ public:
   }
 };
 
-ExtendedVectorType::~ExtendedVectorType() {}
-
-
 static std::map<unsigned, const Type *>
   ExtendedIntegerTypeMap;
 static std::map<std::pair<uintptr_t, uintptr_t>, const Type *>