cmd/compile: use *byte for pointer to string memory
cmd/compile: use *byte for pointer to string memory

Change-Id: I14cff013ef4920d33b5ead0c75d51681bb4f635a
Reviewed-on: https://go-review.googlesource.com/21337
Run-TryBot: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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