Reverting patch. Breaks llvm-gcc build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_23@51504 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/User.h

@@ -46,11 +46,6 @@ protected:
     : Value(Ty, vty), OperandList(OpList), NumOperands(NumOps) {}
 
 public:
-  /// placement delete - required by std, but never called.
-  void operator delete(void*, size_t) {
-    assert(0 && "Constructor throws?");
-  }
-
   Value *getOperand(unsigned i) const {
     assert(i < NumOperands && "getOperand() out of range!");
     return OperandList[i];