Return null for unexpected HW intrinsic (#24219)
Return null for unexpected HW intrinsic (#24219)

Fix #17815
wtgodbe/coreclr,cshung/coreclr,cshung/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,poizan42/coreclr,cshung/coreclr,krk/coreclr,cshung/coreclr,krk/coreclr,poizan42/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr,wtgodbe/coreclr,poizan42/coreclr,poizan42/coreclr,cshung/coreclr,krk/coreclr,poizan42/coreclr,poizan42/coreclr