Revert back Mul._eval_is_imaginary helper, as per 293606b
Revert back Mul._eval_is_imaginary helper, as per 293606b

kaushik94/sympy,garvitr/sympy,VaibhavAgarwalVA/sympy,rahuldan/sympy,cccfran/sympy,debugger22/sympy,AunShiLord/sympy,abhiii5459/sympy,shipci/sympy,asm666/sympy,drufat/sympy,AkademieOlympia/sympy,souravsingh/sympy,Gadal/sympy,kevalds51/sympy,ga7g08/sympy,atsao72/sympy,MridulS/sympy,garvitr/sympy,saurabhjn76/sympy,Shaswat27/sympy,grevutiu-gabriel/sympy,meghana1995/sympy,jbbskinny/sympy,Sumith1896/sympy,emon10005/sympy,beni55/sympy,sahmed95/sympy,Designist/sympy,AkademieOlympia/sympy,MridulS/sympy,rahuldan/sympy,cswiercz/sympy,AunShiLord/sympy,sahilshekhawat/sympy,wyom/sympy,atreyv/sympy,sahilshekhawat/sympy,cswiercz/sympy,kevalds51/sympy,abloomston/sympy,wyom/sympy,sahmed95/sympy,garvitr/sympy,lindsayad/sympy,ga7g08/sympy,Arafatk/sympy,bukzor/sympy,asm666/sympy,farhaanbukhsh/sympy,Gadal/sympy,hargup/sympy,lindsayad/sympy,maniteja123/sympy,kumarkrishna/sympy,Curious72/sympy,Vishluck/sympy,kaushik94/sympy,saurabhjn76/sympy,oliverlee/sympy,madan96/sympy,yukoba/sympy,mcdaniel67/sympy,sahilshekhawat/sympy,saurabhjn76/sympy,jbbskinny/sympy,jaimahajan1997/sympy,abloomston/sympy,dqnykamp/sympy,atsao72/sympy,Titan-C/sympy,cccfran/sympy,kaichogami/sympy,Davidjohnwilson/sympy,drufat/sympy,skidzo/sympy,aktech/sympy,bukzor/sympy,chaffra/sympy,meghana1995/sympy,moble/sympy,Vishluck/sympy,jerli/sympy,MridulS/sympy,skirpichev/omg,VaibhavAgarwalVA/sympy,wanglongqi/sympy,souravsingh/sympy,toolforger/sympy,emon10005/sympy,MechCoder/sympy,yukoba/sympy,abloomston/sympy,grevutiu-gabriel/sympy,skidzo/sympy,pbrady/sympy,shipci/sympy,abhiii5459/sympy,iamutkarshtiwari/sympy,Sumith1896/sympy,sahmed95/sympy,yashsharan/sympy,Arafatk/sympy,Designist/sympy,chaffra/sympy,atreyv/sympy,oliverlee/sympy,drufat/sympy,iamutkarshtiwari/sympy,Titan-C/sympy,rahuldan/sympy,jamesblunt/sympy,wyom/sympy,postvakje/sympy,liangjiaxing/sympy,shikil/sympy,ahhda/sympy,pandeyadarsh/sympy,diofant/diofant,Davidjohnwilson/sympy,postvakje/sympy,emon10005/sympy,atreyv/sympy,moble/sympy,shipci/sympy,sunny94/temp,moble/sympy,kaichogami/sympy,mcdaniel67/sympy,yashsharan/sympy,pbrady/sympy,ChristinaZografou/sympy,iamutkarshtiwari/sympy,grevutiu-gabriel/sympy,wanglongqi/sympy,oliverlee/sympy,beni55/sympy,postvakje/sympy,MechCoder/sympy,Gadal/sympy,ga7g08/sympy,VaibhavAgarwalVA/sympy,Davidjohnwilson/sympy,meghana1995/sympy,sunny94/temp,Titan-C/sympy,kaushik94/sympy,sampadsaha5/sympy,sunny94/temp,debugger22/sympy,vipulroxx/sympy,kaichogami/sympy,jbbskinny/sympy,hargup/sympy,maniteja123/sympy,Shaswat27/sympy,liangjiaxing/sympy,jamesblunt/sympy,madan96/sympy,beni55/sympy,cccfran/sympy,vipulroxx/sympy,Curious72/sympy,dqnykamp/sympy,ahhda/sympy,Mitchkoens/sympy,toolforger/sympy,sampadsaha5/sympy,maniteja123/sympy,farhaanbukhsh/sympy,sampadsaha5/sympy,bukzor/sympy,kevalds51/sympy,hargup/sympy,mafiya69/sympy,atsao72/sympy,yukoba/sympy,shikil/sympy,Mitchkoens/sympy,liangjiaxing/sympy,madan96/sympy,ChristinaZografou/sympy,jerli/sympy,vipulroxx/sympy,Sumith1896/sympy,jaimahajan1997/sympy,ChristinaZografou/sympy,pbrady/sympy,shikil/sympy,Arafatk/sympy,mcdaniel67/sympy,chaffra/sympy,AunShiLord/sympy,pandeyadarsh/sympy,abhiii5459/sympy,cswiercz/sympy,Mitchkoens/sympy,dqnykamp/sympy,farhaanbukhsh/sympy,Shaswat27/sympy,aktech/sympy,jamesblunt/sympy,wanglongqi/sympy,skidzo/sympy,jerli/sympy,yashsharan/sympy,Vishluck/sympy,kumarkrishna/sympy,pandeyadarsh/sympy,toolforger/sympy,MechCoder/sympy,lindsayad/sympy,aktech/sympy,mafiya69/sympy,Curious72/sympy,ahhda/sympy,Designist/sympy,kumarkrishna/sympy,souravsingh/sympy,AkademieOlympia/sympy,debugger22/sympy,jaimahajan1997/sympy,asm666/sympy,mafiya69/sympy