rusyaev-roman added a comment.

In sum, this change brings the following improvements for all graph traversal 
iterators that are used in 'range-based for loop':

- avoid creating an empty iterator (that holds containers inside) to compare 
with the end iterator
- make 'empty()' call explicit (instead of comparing two containers of 
iterators) when an iterator is compared with the end iterator


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D131448/new/

https://reviews.llvm.org/D131448

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