[llvm] [Attributor] Change allocation size and load/store offsets using AAPointerInfo for Alloca instructions (PR #72029)

[Shilei Tian via llvm-commits]

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@@ -6120,6 +6170,9 @@ struct AAPointerInfo : public AbstractAttribute {
   virtual const_bin_iterator begin() const = 0;
   virtual const_bin_iterator end() const = 0;
   virtual int64_t numOffsetBins() const = 0;
+  virtual void dumpState(raw_ostream &O) const = 0;
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shiltian wrote:

Like I mentioned before, there are pure virtual functions, so we will want to mark the c'tor of `AAPointerInfo` to be `protected`.

https://github.com/llvm/llvm-project/pull/72029