5deb787c02
Because GISel doesn't distinquish integer and FP types, we need to allow s16/s32 as legal inputs/outputs of G_SEXT and G_ZEXT. This requires a extra isel patterns to support the cross product of these types that we don't need for SelectionDAG. We also needed to add i16/i32 to the GPR register class which prevents some type inferencing in tablegen and increases the size of the RISCVGenDAGISel.inc by 2K. This patch proposes to do manual selection so we can remove these patterns and eventually remove the types from the register class.
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