[flang-commits] [flang] [flang][acc] Implement cache directive lowering (PR #174897)

[Razvan Lupusoru via flang-commits]

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+! This test checks lowering of OpenACC cache directive.
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razvanlupusoru wrote:

Two more cases I still think need to be covered in testing (can be done in a follow-up change):
- orphan cache directive (not in any loop or acc region)
- uses of the `acc cache` variables AFTER the region it is cached in - to make sure that original variable is supplied.

https://github.com/llvm/llvm-project/pull/174897