Add mad support for v_pk_* 16 bit integer (#95104)

Author: dstutt

llvm/lib/Target/AMDGPU/VOP3PInstructions.td

@@ -90,7 +90,7 @@ multiclass VOP3_VOP3PInst<string OpName, VOP3P_Mix_Profile P> {
 let isReMaterializable = 1 in {
 let isCommutable = 1 in {
 defm V_PK_MAD_I16 : VOP3PInst<"v_pk_mad_i16", VOP3P_Profile<VOP_V2I16_V2I16_V2I16_V2I16>>;
-defm V_PK_MAD_U16 : VOP3PInst<"v_pk_mad_u16", VOP3P_Profile<VOP_V2I16_V2I16_V2I16_V2I16>>;
+defm V_PK_MAD_U16 : VOP3PInst<"v_pk_mad_u16", VOP3P_Profile<VOP_V2I16_V2I16_V2I16_V2I16>, imad>;
 
 let FPDPRounding = 1 in {
 defm V_PK_FMA_F16 : VOP3PInst<"v_pk_fma_f16", VOP3P_Profile<VOP_V2F16_V2F16_V2F16_V2F16>, any_fma>;