[llvm] [LV] Add LoopVectorize/VPlan subdirectory for VPlan printing tests. (PR #180611)

[Luke Lau via llvm-commits]

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lukel97 wrote:

Same here with the REQUIRES: asserts line. I presume every moved file must have that line which can be removed?

https://github.com/llvm/llvm-project/pull/180611