Retain LLT type information by creating new LLTs from the original LLT instead of only using the original scalar size. This PR prepares for the [LLT FPInfo RFC](https://discourse.llvm.org/t/rfc-globalisel-adding-fp-type-information-to-llt/83349/24) where LLTs will carry additional floating point type information in addition to the scalar size.
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271 KiB