Revert 259942, r259943, r259948.

The Windows bots have been failing for the last two days, with:

FAILED: C:\PROGRA~2\MICROS~1.0\VC\bin\amd64\cl.exe -c LLVMContextImpl.cpp
D:\buildslave\clang-x64-ninja-win7\llvm\lib\IR\LLVMContextImpl.cpp(137) :
    error C2248: 'llvm::TrailingObjects<llvm::AttributeSetImpl,
                                        llvm::IndexAttrPair>::operator delete' :
        cannot access private member declared in class 'llvm::AttributeSetImpl'
    TrailingObjects.h(298) : see declaration of
        'llvm::TrailingObjects<llvm::AttributeSetImpl,
                               llvm::IndexAttrPair>::operator delete'
    AttributeImpl.h(213) : see declaration of 'llvm::AttributeSetImpl'

llvm-svn: 260053

include/llvm/Support/TrailingObjects.h

@@ -290,13 +290,9 @@ class TrailingObjects : private trailing_objects_internal::TrailingObjectsImpl<
   }
 
 public:
-  // Make this (privately inherited) member public.
+  // make this (privately inherited) class public.
   using ParentType::OverloadToken;
 
-  /// Disable sized deallocation for all objects with trailing object storage;
-  /// the inferred size will typically not be correct.
-  void operator delete(void *P) { return ::operator delete(P); }
-
   /// Returns a pointer to the trailing object array of the given type
   /// (which must be one of those specified in the class template). The
   /// array may have zero or more elements in it.

lib/IR/AttributeImpl.h

@@ -171,8 +171,6 @@ class AttributeSetNode final
   void operator=(const AttributeSetNode &) = delete;
   AttributeSetNode(const AttributeSetNode &) = delete;
 public:
-  using TrailingObjects<AttributeSetNode, Attribute>::operator delete;
-
   static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
 
   bool hasAttribute(Attribute::AttrKind Kind) const {
@@ -268,8 +266,6 @@ public:
     }
   }
 
-  using TrailingObjects<AttributeSetImpl, IndexAttrPair>::operator delete;
-
   /// \brief Get the context that created this AttributeSetImpl.
   LLVMContext &getContext() { return Context; }
 

unittests/Support/TrailingObjectsTest.cpp

@@ -34,7 +34,6 @@ public:
     void *Mem = ::operator new(totalSizeToAlloc<short>(NumShorts));
     return new (Mem) Class1(ShortArray, NumShorts);
   }
-  using TrailingObjects::operator delete;
 
   short get(unsigned Num) const { return getTrailingObjects<short>()[Num]; }
 
@@ -79,7 +78,6 @@ public:
       *C->getTrailingObjects<double>() = D;
     return C;
   }
-  using TrailingObjects::operator delete;
 
   short getShort() const {
     if (!HasShort)