[AttrBuilder] Remove unused removeAttributes() overload

The idiomatic way would be to call remove() with an AttributeMask
constructed from an AttributeSet.

llvm/include/llvm/IR/Attributes.h

@@ -1048,9 +1048,6 @@ public:
       return removeAttribute(A.getKindAsEnum());
   }
 
-  /// Remove the attributes from the builder.
-  AttrBuilder &removeAttributes(AttributeList A, uint64_t WithoutIndex);
-
   /// Add the attributes from the builder.
   AttrBuilder &merge(const AttrBuilder &B);
 

llvm/lib/IR/Attributes.cpp

@@ -1608,11 +1608,6 @@ AttrBuilder &AttrBuilder::addAttribute(StringRef A, StringRef V) {
   return addAttribute(Attribute::get(Ctx, A, V));
 }
 
-AttrBuilder &AttrBuilder::removeAttributes(AttributeList AL, uint64_t Index) {
-  remove(AttributeMask(AL.getAttributes(Index)));
-  return *this;
-}
-
 AttrBuilder &AttrBuilder::removeAttribute(Attribute::AttrKind Val) {
   assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
   Attrs[Val] = false;