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Replacing hal.tensor.export storage for hal.tensor.alias. (iree-org#1…
…7339) This fixes a design issue in the original `hal.tensor.export` optional storage feature that would lead to the export happening after any `hal.tensor.barrier` ops that may have been used on the source tensor. The new op is intended to be inserted prior to the barriers and can also be inserted elsewhere (not just at ABI boundaries). Minor improvements were required to folding of `stream.async.update` in order to ensure the aliased buffers are used in cases where barriers are present between producers and the alias ops consuming the values. iree-org#17135 made the folder too conservative and would result in all in-place operations of external values getting extra copies. Fixes iree-org#17316.
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