[flang-commits] [flang] [flang] Allow lowering of sub-expressions to be overridden (PR #69944)

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jeanPerier wrote:

> think you have to work with Jean on how to merge this patch. Whether the current patch can go in as it is with the failing OpenMP & OpenACC tests XFAILed, or only the expression lowering infrastructure improvement goes in and then you can update the OpenMP/OpenACC lowering code using this new infrastructure.

Thanks @kiranchandramohan, with your guidance to generate the non atomic expr evaluation outside of the atomic.capture. Please @razvanlupusoru, @clementval, and @NimishMishra, check that the updated tests match what you expect. Then I can push all of it if it easier.

(I rebased with hope to pass the git fetch error of the build bot)

https://github.com/llvm/llvm-project/pull/69944