llvm-project

d8a29652 - [ADT] Adding bidirectional iterator functionality + unit tests (#160726)

[ADT] Adding bidirectional iterator functionality + unit tests (#160726) This feature is needed for #160415 , kuhar suggested that I split that PR into 2 so that the ADT work is checking in first. --------- Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>