message: Introducing a const qualifier
  Summary:
  The analysis operates on `const IRInstruction*` but the querying interface
  asked for a mutable pointer.  This was not necessary it turned out.
diff: @@ -230,7 +230,9 @@ class BlameMap {
  * analysis will both result in a result that indicates no allocations
  * occurred.
  */
  - Value get(IRInstruction* alloc) const { return Value{m_domain.get(alloc)}; }
  + Value get(const IRInstruction* alloc) const {
  + return Value{m_domain.get(alloc)};
  + }
  private:
  BlameStore::Domain m_domain;
  