std: Stabilize Atomic{Isize,Usize} methods
std: Stabilize Atomic{Isize,Usize} methods

These methods were intended to be stable as of #16258 but the tags have since
been lost in various refactorings. This commit re-adds the `#[stable]`
attributes to each of these functions.

jashank/rust,kwantam/rust,KokaKiwi/rust,omasanori/rust,sae-bom/rust,mihneadb/rust,GBGamer/rust,ebfull/rust,graydon/rust,cllns/rust,mihneadb/rust,aepsil0n/rust,avdi/rust,AerialX/rust-rt-minimal,carols10cents/rust,jashank/rust,untitaker/rust,ebfull/rust,KokaKiwi/rust,dwillmer/rust,vhbit/rust,richo/rust,rprichard/rust,victorvde/rust,jroesch/rust,KokaKiwi/rust,vhbit/rust,pelmers/rust,carols10cents/rust,vhbit/rust,GBGamer/rust,l0kod/rust,untitaker/rust,AerialX/rust-rt-minimal,sae-bom/rust,pshc/rust,rohitjoshi/rust,richo/rust,ejjeong/rust,l0kod/rust,reem/rust,mdinger/rust,XMPPwocky/rust,richo/rust,pelmers/rust,dwillmer/rust,rprichard/rust,nwin/rust,AerialX/rust-rt-minimal,cllns/rust,mdinger/rust,kwantam/rust,zaeleus/rust,omasanori/rust,ruud-v-a/rust,zubron/rust,richo/rust,aidancully/rust,jashank/rust,nwin/rust,hauleth/rust,seanrivera/rust,TheNeikos/rust,aneeshusa/rust,andars/rust,GBGamer/rust,AerialX/rust,philyoon/rust,ruud-v-a/rust,zaeleus/rust,zubron/rust,ejjeong/rust,nwin/rust,avdi/rust,XMPPwocky/rust,jroesch/rust,AerialX/rust-rt-minimal,nwin/rust,bombless/rust,mvdnes/rust,avdi/rust,graydon/rust,mahkoh/rust,jroesch/rust,mahkoh/rust,reem/rust,l0kod/rust,GBGamer/rust,rohitjoshi/rust,victorvde/rust,mahkoh/rust,kwantam/rust,aneeshusa/rust,vhbit/rust,philyoon/rust,aidancully/rust,seanrivera/rust,victorvde/rust,andars/rust,andars/rust,krzysz00/rust,nwin/rust,TheNeikos/rust,aepsil0n/rust,miniupnp/rust,TheNeikos/rust,victorvde/rust,kwantam/rust,pelmers/rust,robertg/rust,omasanori/rust,aneeshusa/rust,untitaker/rust,gifnksm/rust,miniupnp/rust,reem/rust,l0kod/rust,jashank/rust,mvdnes/rust,dwillmer/rust,mihneadb/rust,zubron/rust,dwillmer/rust,hauleth/rust,gifnksm/rust,mdinger/rust,rohitjoshi/rust,KokaKiwi/rust,mahkoh/rust,rprichard/rust,reem/rust,aneeshusa/rust,aidancully/rust,nwin/rust,ebfull/rust,rohitjoshi/rust,AerialX/rust-rt-minimal,sae-bom/rust,mvdnes/rust,mihneadb/rust,zubron/rust,graydon/rust,hauleth/rust,zachwick/rust,krzysz00/rust,seanrivera/rust,dwillmer/rust,TheNeikos/rust,mihneadb/rust,TheNeikos/rust,andars/rust,AerialX/rust,avdi/rust,hauleth/rust,sae-bom/rust,ebfull/rust,hauleth/rust,rprichard/rust,aepsil0n/rust,kwantam/rust,GBGamer/rust,miniupnp/rust,ebfull/rust,rprichard/rust,seanrivera/rust,richo/rust,zubron/rust,untitaker/rust,zaeleus/rust,ejjeong/rust,avdi/rust,carols10cents/rust,seanrivera/rust,bombless/rust,dwillmer/rust,ejjeong/rust,nwin/rust,pshc/rust,zachwick/rust,carols10cents/rust,graydon/rust,sae-bom/rust,aidancully/rust,mvdnes/rust,carols10cents/rust,philyoon/rust,mahkoh/rust,zaeleus/rust,zachwick/rust,jroesch/rust,robertg/rust,KokaKiwi/rust,jroesch/rust,XMPPwocky/rust,l0kod/rust,mvdnes/rust,jashank/rust,AerialX/rust,philyoon/rust,jroesch/rust,vhbit/rust,ruud-v-a/rust,dwillmer/rust,kwantam/rust,rprichard/rust,jroesch/rust,untitaker/rust,zachwick/rust,gifnksm/rust,philyoon/rust,sae-bom/rust,krzysz00/rust,zachwick/rust,cllns/rust,dwillmer/rust,rohitjoshi/rust,jroesch/rust,XMPPwocky/rust,pshc/rust,KokaKiwi/rust,pshc/rust,vhbit/rust,ruud-v-a/rust,AerialX/rust,graydon/rust,aneeshusa/rust,l0kod/rust,pelmers/rust,jashank/rust,gifnksm/rust,AerialX/rust,robertg/rust,pshc/rust,pelmers/rust,krzysz00/rust,cllns/rust,mdinger/rust,aepsil0n/rust,reem/rust,aidancully/rust,aepsil0n/rust,XMPPwocky/rust,avdi/rust,miniupnp/rust,graydon/rust,pshc/rust,miniupnp/rust,mdinger/rust,ruud-v-a/rust,omasanori/rust,ebfull/rust,AerialX/rust,zubron/rust,l0kod/rust,hauleth/rust,carols10cents/rust,zubron/rust,victorvde/rust,GBGamer/rust,vhbit/rust,aneeshusa/rust,andars/rust,pshc/rust,zaeleus/rust,mdinger/rust,pshc/rust,zaeleus/rust,l0kod/rust,GBGamer/rust,aepsil0n/rust,TheNeikos/rust,robertg/rust,mahkoh/rust,krzysz00/rust,jashank/rust,robertg/rust,miniupnp/rust,bombless/rust,reem/rust,jashank/rust,nwin/rust,omasanori/rust,gifnksm/rust,vhbit/rust,bombless/rust,rohitjoshi/rust,krzysz00/rust,miniupnp/rust,bombless/rust,aidancully/rust,untitaker/rust,seanrivera/rust,AerialX/rust-rt-minimal,robertg/rust,XMPPwocky/rust,ruud-v-a/rust,cllns/rust,pelmers/rust,miniupnp/rust,ejjeong/rust,andars/rust,GBGamer/rust,ejjeong/rust,philyoon/rust,mihneadb/rust,gifnksm/rust,zubron/rust,bombless/rust,victorvde/rust,omasanori/rust,richo/rust,cllns/rust,mvdnes/rust,zachwick/rust