[compiler/StableHloExt] Incorporate some simplification patterns from upstream StableHLO #384
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Our next LLVM & StableHLO upgrade will incorporate some additional simplification
patterns. However, the upgrade is large and will not fully land until mid
next week.
Until then, incorporate some critical concat and slice simplification patterns
that simplify shape calculation IR. Solves #381.
GitOrigin-RevId: 2a875a35547b89c96d530878907312a0f898e508