IR: Remove null UseList checks in hasNUses methods

Author: arsenm

llvm/lib/IR/Value.cpp

@@ -148,18 +148,10 @@ void Value::destroyValueName() {
 }
 
 bool Value::hasNUses(unsigned N) const {
-  if (!UseList)
-    return N == 0;
-
-  // TODO: Disallow for ConstantData and remove !UseList check?
   return hasNItems(use_begin(), use_end(), N);
 }
 
 bool Value::hasNUsesOrMore(unsigned N) const {
-  // TODO: Disallow for ConstantData and remove !UseList check?
-  if (!UseList)
-    return N == 0;
-
   return hasNItemsOrMore(use_begin(), use_end(), N);
 }