[InstCombine] Canonicalize more geps with constant gep bases and constant offsets. (#110033) This is another small but hopefully not performance negative step to canonicalizing towards i8 geps. We looks for geps with a constant offset base pointer of the form `gep (gep @glob, C1), x, C2` and expand the gep instruction, so that the constant can hopefully be combined together (or the x offset can be computed in common).
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