don't let Reid build void*'s :)

llvm-svn: 21571

llvm/lib/VMCore/Type.cpp

@@ -1110,6 +1110,8 @@ static TypeMap<PointerValType, PointerType> PointerTypes;
 
 PointerType *PointerType::get(const Type *ValueType) {
   assert(ValueType && "Can't get a pointer to <null> type!");
+  assert(ValueType != Type::VoidTy &&
+         "Pointer to void is not valid, use sbyte* instead!");
   PointerValType PVT(ValueType);
 
   PointerType *PT = PointerTypes.get(PVT);