auto merge of #19819 : vadimcn/rust/fix-demangle, r=alexcrichton
auto merge of #19819 : vadimcn/rust/fix-demangle, r=alexcrichton

Windows dbghelp strips leading underscores from symbols, and I could not find a way to turn this off.  So let's accept  "ZN...E" form too.
Also, print PC displacement from symbols.  This is helpful in gauging whether the PC was indeed within the function displayed in the backtrace, or whether it just happened to be the closest public symbol in the module.

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