[dev.ssa] cmd/compile: get rid of +0.0 hack
[dev.ssa] cmd/compile: get rid of +0.0 hack

The conversion from -0.0 to +0.0 happens inside mpgetflt now.
The SSA code doesn't need this fix any more.

Change-Id: I6cd4f4a4e75b13cf284ebbb95b08af050ed9891c
Reviewed-on: https://go-review.googlesource.com/18942
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

momchil-velikov/go,ImJasonH/go,derekmarcotte/go,suncycheng/go,nawawi/go,suncycheng/go,nawawi/go,nawawi/go,CAFxX/go,binarycrusader/go,golang/go,cloudflare/go,golang/go,miolini/go,vanloswang/go,Cofyc/go,polyverse-security/go,nawawi/go,derekmarcotte/go,miolini/go,cloudflare/go,ganboing/go-esx,momchil-velikov/go,mwhudson/go,golang/go,momchil-velikov/go,4ad/go,binarycrusader/go,codestation/go,polyverse-security/go,vsekhar/elastic-go,cloudflare/go,codestation/go,mwhudson/go,CAFxX/go,Samurais/go,binarycrusader/go,josharian/go,akutz/go,derekmarcotte/go,mwhudson/go,miolini/go,momchil-velikov/go,golang/go,linux-on-ibm-z/go,Cofyc/go,linux-on-ibm-z/go,vanloswang/go,vsekhar/elastic-go,theif519/go,golang/go,goodlang/good,binarycrusader/go,suncycheng/go,ImJasonH/go,theif519/go,4ad/go,momchil-velikov/go,vanloswang/go,derekmarcotte/go,ImJasonH/go,codestation/go,golang/go,nawawi/go,suncycheng/go,Cofyc/go,ImJasonH/go,Samurais/go,cloudflare/go,miolini/go,akutz/go,binarycrusader/go,miolini/go,ImJasonH/go,codestation/go,vanloswang/go,akutz/go,momchil-velikov/go,josharian/go,goodlang/good,Samurais/go,josharian/go,ganboing/go-esx,derekmarcotte/go,binarycrusader/go,miolini/go,linux-on-ibm-z/go,cloudflare/go,goodlang/good,goodlang/good,vanloswang/go,christopher-henderson/Go,golang/go,momchil-velikov/go,4ad/go,cloudflare/go,vsekhar/elastic-go,theif519/go,josharian/go,linux-on-ibm-z/go,CAFxX/go,linux-on-ibm-z/go,vsekhar/elastic-go,golang/go,theif519/go,goodlang/good,theif519/go,linux-on-ibm-z/go,miolini/go,vsekhar/elastic-go,goodlang/good,vsekhar/elastic-go,momchil-velikov/go,polyverse-security/go,polyverse-security/go,mwhudson/go,theif519/go,CAFxX/go,Cofyc/go,polyverse-security/go,mwhudson/go,josharian/go,cloudflare/go,binarycrusader/go,akutz/go,derekmarcotte/go,mwhudson/go,mwhudson/go,polyverse-security/go,Cofyc/go,4ad/go,Samurais/go,ganboing/go-esx,mwhudson/go,linux-on-ibm-z/go,ImJasonH/go,suncycheng/go,vanloswang/go,4ad/go,derekmarcotte/go,codestation/go,ganboing/go-esx,ganboing/go-esx,binarycrusader/go,ganboing/go-esx,vanloswang/go,4ad/go,linux-on-ibm-z/go,Samurais/go,josharian/go,nawawi/go,polyverse-security/go,theif519/go,goodlang/good,codestation/go,Samurais/go,Cofyc/go,ganboing/go-esx,vsekhar/elastic-go,Cofyc/go,Samurais/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,vsekhar/elastic-go,josharian/go,CAFxX/go,theif519/go,ImJasonH/go,polyverse-security/go,akutz/go,vanloswang/go,akutz/go,Samurais/go,Cofyc/go,ImJasonH/go,CAFxX/go,suncycheng/go,CAFxX/go,miolini/go,derekmarcotte/go,goodlang/good,4ad/go,codestation/go,akutz/go,codestation/go,suncycheng/go,suncycheng/go,4ad/go,josharian/go,ganboing/go-esx