[llvm] [Float2Int] Resolve FIXME: Pick the smallest legal type that fits (PR #79158)

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AtariDreams wrote:

<img width="668" alt="Screenshot 2024-03-19 at 3 31 09 PM" src="https://github.com/llvm/llvm-project/assets/83477269/24bbe8ef-c227-4f0b-b820-955e400e030a">
The issue in question is not the Float2Int pass. 

https://github.com/llvm/llvm-project/pull/79158