+ /// \brief Accumulate the constant address offset of this GEP if possible.
+ ///
+ /// This routine accepts an APInt into which it will accumulate the constant
+ /// offset of this GEP if the GEP is in fact constant. If the GEP is not
+ /// all-constant, it returns false and the value of the offset APInt is
+ /// undefined (it is *not* preserved!). The APInt passed into this routine
+ /// must be at least as wide as the IntPtr type for the address space of
+ /// the base GEP pointer.
+ bool accumulateConstantOffset(const DataLayout &DL, APInt &Offset) const;
+