[RISCV][GISel] Add isel patterns for i16 load/store #116293
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In order to support f16 load/store we need to make load/stores with s16 register type legal. If regbank selection doesn't pick the FPR bank, we'll be left with a GPR load or store which we don't have isel patterns for from SelectionDAG. In order to add the patterns we need to make i16 a legal type for the GPR register class. Tests are currently disabling the legality check because I haven't update the legalizer yet.
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In order to support f16 load/store we need to make load/stores with s16 register type legal. If regbank selection doesn't pick the FPR bank, we'll be left with a GPR load or store which we don't have isel patterns for from SelectionDAG.
In order to add the patterns we need to make i16 a legal type for the GPR register class.
Tests are currently disabling the legality check because I haven't update the legalizer yet.