Fix CSE bug with GT_MUL and GTF_MUL_64RSLT
Fix CSE bug with GT_MUL and GTF_MUL_64RSLT

Unconditionally set op1 and op2 as GTF_DONT_CSE.
Previously, this was only done if the cast was not
a GT_NOP. It is possible for it already to come in
as GT_NOP, thus leading to the possibility to CSE
the operand, and leading to this assert firing:
```
assert(tree->gtIsValid64RsltMul());
```

James-Ko/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,mmitche/coreclr,krk/coreclr,yizhang82/coreclr,pgavlin/coreclr,botaberg/coreclr,wtgodbe/coreclr,mskvortsov/coreclr,ragmani/coreclr,krk/coreclr,krk/coreclr,hseok-oh/coreclr,yizhang82/coreclr,James-Ko/coreclr,rartemev/coreclr,tijoytom/coreclr,kyulee1/coreclr,parjong/coreclr,ragmani/coreclr,yizhang82/coreclr,yeaicc/coreclr,krk/coreclr,yeaicc/coreclr,alexperovich/coreclr,poizan42/coreclr,YongseopKim/coreclr,mskvortsov/coreclr,dpodder/coreclr,sagood/coreclr,JonHanna/coreclr,krytarowski/coreclr,gkhanna79/coreclr,cmckinsey/coreclr,AlexGhiondea/coreclr,sagood/coreclr,wateret/coreclr,tijoytom/coreclr,krytarowski/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,JonHanna/coreclr,cshung/coreclr,wateret/coreclr,krytarowski/coreclr,cydhaselton/coreclr,alexperovich/coreclr,gkhanna79/coreclr,dpodder/coreclr,cydhaselton/coreclr,sagood/coreclr,yizhang82/coreclr,ragmani/coreclr,parjong/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,cshung/coreclr,krk/coreclr,dpodder/coreclr,alexperovich/coreclr,wateret/coreclr,mmitche/coreclr,tijoytom/coreclr,jamesqo/coreclr,poizan42/coreclr,AlexGhiondea/coreclr,rartemev/coreclr,JosephTremoulet/coreclr,wtgodbe/coreclr,yeaicc/coreclr,yeaicc/coreclr,dpodder/coreclr,pgavlin/coreclr,wateret/coreclr,hseok-oh/coreclr,russellhadley/coreclr,poizan42/coreclr,YongseopKim/coreclr,cmckinsey/coreclr,wtgodbe/coreclr,YongseopKim/coreclr,qiudesong/coreclr,mskvortsov/coreclr,mmitche/coreclr,kyulee1/coreclr,James-Ko/coreclr,rartemev/coreclr,tijoytom/coreclr,pgavlin/coreclr,cmckinsey/coreclr,krytarowski/coreclr,botaberg/coreclr,kyulee1/coreclr,botaberg/coreclr,krytarowski/coreclr,cydhaselton/coreclr,gkhanna79/coreclr,qiudesong/coreclr,kyulee1/coreclr,qiudesong/coreclr,yizhang82/coreclr,cshung/coreclr,sagood/coreclr,cydhaselton/coreclr,JonHanna/coreclr,JonHanna/coreclr,pgavlin/coreclr,alexperovich/coreclr,jamesqo/coreclr,parjong/coreclr,pgavlin/coreclr,sagood/coreclr,cshung/coreclr,qiudesong/coreclr,sagood/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,mmitche/coreclr,cshung/coreclr,poizan42/coreclr,wateret/coreclr,mskvortsov/coreclr,yeaicc/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,yeaicc/coreclr,AlexGhiondea/coreclr,russellhadley/coreclr,YongseopKim/coreclr,JosephTremoulet/coreclr,ruben-ayrapetyan/coreclr,russellhadley/coreclr,krytarowski/coreclr,ragmani/coreclr,rartemev/coreclr,jamesqo/coreclr,gkhanna79/coreclr,cmckinsey/coreclr,dpodder/coreclr,botaberg/coreclr,cydhaselton/coreclr,wtgodbe/coreclr,tijoytom/coreclr,alexperovich/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,hseok-oh/coreclr,parjong/coreclr,qiudesong/coreclr,cmckinsey/coreclr,jamesqo/coreclr,YongseopKim/coreclr,russellhadley/coreclr,cmckinsey/coreclr,hseok-oh/coreclr,mskvortsov/coreclr,botaberg/coreclr,gkhanna79/coreclr,mmitche/coreclr,mskvortsov/coreclr,cshung/coreclr,wtgodbe/coreclr,poizan42/coreclr,kyulee1/coreclr,James-Ko/coreclr,botaberg/coreclr,poizan42/coreclr,ragmani/coreclr,parjong/coreclr,dpodder/coreclr,AlexGhiondea/coreclr,rartemev/coreclr,JonHanna/coreclr,ragmani/coreclr,gkhanna79/coreclr,yeaicc/coreclr,YongseopKim/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,James-Ko/coreclr,kyulee1/coreclr,cydhaselton/coreclr,russellhadley/coreclr,jamesqo/coreclr,mmitche/coreclr,pgavlin/coreclr,AlexGhiondea/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,russellhadley/coreclr,yizhang82/coreclr,ruben-ayrapetyan/coreclr,qiudesong/coreclr,rartemev/coreclr,alexperovich/coreclr,cmckinsey/coreclr,JonHanna/coreclr,tijoytom/coreclr