Improve resiliency of LoadIBCMethodHelper (#23057)
Improve resiliency of LoadIBCMethodHelper (#23057)

The encoded slot could be bogus and we would end up asserting for this.
mmitche/coreclr,krk/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,krk/coreclr,wtgodbe/coreclr,krk/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,cshung/coreclr,wtgodbe/coreclr,mmitche/coreclr,krk/coreclr,cshung/coreclr,mmitche/coreclr,mmitche/coreclr,poizan42/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,mmitche/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,krk/coreclr,cshung/coreclr