Add check for non-contiguous memory access when lowering to async dma… #13613
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… copies.
Currently we do not support non contiguous memory copies for async dma so this adds a check to error out in the case that either load or store is non contiguous. Unfortunately if we do not throw an error in this case then we get inaccurate outputs. Added a test to verify that we are indeed throwing an error in this case that should be removed once support is added.
@adstraw @masahi