Unconditionally set the base element type to the condition base element type

But only if the condition is a HW intrinsic.

Author: BruceForstall

src/coreclr/jit/lowerxarch.cpp

@@ -3882,21 +3882,13 @@ GenTree* Lowering::LowerHWIntrinsicTernaryLogic(GenTreeHWIntrinsic* node)
                 NamedIntrinsic intrinsicId = node->GetHWIntrinsicId();
                 assert(HWIntrinsicInfo::NeedsNormalizeSmallTypeToInt(intrinsicId));
 
-                // The condition mask element size is expected to be the same size as the TernaryLogic
-                // node element size, unless the condition element size is short, in which case the
-                // TernaryLogic node element size would have been normalized.
-                // However, there is code, such as for double->int conversions, that generates a 'double'
-                // base type mask for a TernaryLogic node with base type 'int'. That works because it only
-                // cares about the '0' elem, as the result will be cast to scalar.
-                var_types conditionBaseType = condition->AsHWIntrinsic()->GetSimdBaseType();
-                uint32_t  conditionElemSize = genTypeSize(conditionBaseType);
-                uint32_t  elemSize          = genTypeSize(simdBaseType);
-                if (varTypeIsSmall(conditionBaseType) && (conditionElemSize < elemSize))
+                if (!condition->OperIsHWIntrinsic())
                 {
-                    CorInfoType simdBaseJitTypeCondition = condition->AsHWIntrinsic()->GetSimdBaseJitType();
-                    node->AsHWIntrinsic()->SetSimdBaseJitType(simdBaseJitTypeCondition);
+                    break;
                 }
 
+                node->SetSimdBaseJitType(condition->AsHWIntrinsic()->GetSimdBaseJitType());
+
                 node->ResetHWIntrinsicId(NI_EVEX_BlendVariableMask, comp, selectFalse, selectTrue, condition);
                 BlockRange().Remove(op4);
                 break;