[dev.ssa] cmd/compile: minor CSE cleanup
[dev.ssa] cmd/compile: minor CSE cleanup

Remove unnecessary local var split.

Change-Id: I907ef682b5fd9b3a67771edd1fe90c558f8937ea
Reviewed-on: https://go-review.googlesource.com/14523
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

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