DataLayout: Fix latent issues with getMaxIndexSizeInBits (#118740) Because it was implemented in terms of getMaxIndexSize, it was always rounding the values up to a multiple of 8. Additionally, it was using the PointerSpec's BitWidth rather than its IndexBitWidth, which was self-evidently incorrect. Since getMaxIndexSize was only used by getMaxIndexSizeInBits, and its name and function seem niche and somewhat confusing, go ahead and remove it until a concrete need for it arises.
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