[SandboxIR][Region] Implement an auxiliary vector in Region (#126376) This patch adds additional functionality to the sandboxir Region. The Region is used as a way of passing a set of Instructions across region passes in a way that can be represented in the IR with metadata. This is a design choice that allows us to test region passes in isolation with lit tests. Up until now the region was only used to tag the instructions generated by the passes. There is a need to represent an ordered set of instructions, which can be used as a way to represent the initial seeds to the first vectorization pass. This patch implements this auxiliary vector that can be used to convey such information.
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