misc/ios: keep whole buffer in go_darwin_arm_exec
misc/ios: keep whole buffer in go_darwin_arm_exec

The existing go_darwin_arm_exec.go script does not work with Xcode 7,
not due to any significant changes, but just ordering and timing of
statements from lldb. Unfortunately the current design of
go_darwin_arm_exec.go makes it not obvious what gets stuck where, so
this moves from a moving buffer window to a complete buffer of the
lldb output.

The result is easier code to follow, and it works with Xcode 7.

Updates #12660.

Change-Id: I3b8b890b0bf4474119482e95d84e821a86d1eaed
Reviewed-on: https://go-review.googlesource.com/16634
Reviewed-by: Michael Matloob <4562438b12c14e81a47550acde616ff328a909f8@golang.org>

deft-code/go,ganboing/go-esx,cyberroadie/go,Endika/go,sndnvaps/go,codestation/go,Samurais/go,suncycheng/go,momchil-velikov/go,suncycheng/go,Samurais/go,sndnvaps/go,vanloswang/go,christopher-henderson/Go,binarycrusader/go,Samurais/go,vsekhar/elastic-go,CAFxX/go,ImJasonH/go,josharian/go,fjballest/golang,vanloswang/go,Endika/go,4ad/go,Samurais/go,vsekhar/elastic-go,akutz/go,akutz/go,josharian/go,golang/go,momchil-velikov/go,goodlang/good,rachtsingh/gogojuice,Cofyc/go,linux-on-ibm-z/go,Cofyc/go,linux-on-ibm-z/go,kim-racktop/go,Cofyc/go,kim-racktop/go,goodlang/good,vanloswang/go,nawawi/go,ganboing/go-esx,akutz/go,Cofyc/go,CAFxX/go,mwhudson/go,cloudflare/go,CAFxX/go,binarycrusader/go,miolini/go,ganboing/go-esx,polyverse-security/go,vsekhar/elastic-go,vanloswang/go,derekmarcotte/go,cyberroadie/go,cloudflare/go,miolini/go,derekmarcotte/go,roth1002/go,vanloswang/go,vanloswang/go,cloudflare/go,kim-racktop/go,fjballest/golang,ImJasonH/go,goodlang/good,CAFxX/go,sndnvaps/go,4ad/go,theif519/go,binarycrusader/go,mwhudson/go,nawawi/go,kim-racktop/go,4ad/go,roth1002/go,rachtsingh/gogojuice,binarycrusader/go,goodlang/good,CAFxX/go,golang/go,goodlang/good,rachtsingh/gogojuice,ImJasonH/go,akutz/go,Endika/go,vsekhar/elastic-go,derekmarcotte/go,codestation/go,Endika/go,binarycrusader/go,Jordanzuo/go,theif519/go,Jordanzuo/go,cloudflare/go,akutz/go,codestation/go,rachtsingh/gogojuice,deft-code/go,roth1002/go,Cofyc/go,Endika/go,josharian/go,suncycheng/go,polyverse-security/go,cyberroadie/go,linux-on-ibm-z/go,derekmarcotte/go,linux-on-ibm-z/go,ganboing/go-esx,akutz/go,polyverse-security/go,Endika/go,rachtsingh/gogojuice,polyverse-security/go,miolini/go,vsekhar/elastic-go,odeke-em/go,Jordanzuo/go,miolini/go,kim-racktop/go,suncycheng/go,miolini/go,suncycheng/go,ImJasonH/go,akutz/go,golang/go,rachtsingh/gogojuice,polyverse-security/go,linux-on-ibm-z/go,goodlang/good,vanloswang/go,deft-code/go,4ad/go,nawawi/go,vsekhar/elastic-go,deft-code/go,josharian/go,deft-code/go,Jordanzuo/go,polyverse-security/go,ganboing/go-esx,vsekhar/elastic-go,derekmarcotte/go,miolini/go,nawawi/go,binarycrusader/go,Samurais/go,sndnvaps/go,4ad/go,4ad/go,ganboing/go-esx,derekmarcotte/go,mwhudson/go,mwhudson/go,fjballest/golang,sndnvaps/go,polyverse-security/go,codestation/go,goodlang/good,binarycrusader/go,golang/go,CAFxX/go,CAFxX/go,vsekhar/elastic-go,momchil-velikov/go,golang/go,fjballest/golang,mwhudson/go,derekmarcotte/go,momchil-velikov/go,Endika/go,cloudflare/go,linux-on-ibm-z/go,nawawi/go,ImJasonH/go,cloudflare/go,josharian/go,roth1002/go,ImJasonH/go,odeke-em/go,Jordanzuo/go,fjballest/golang,cyberroadie/go,ganboing/go-esx,kim-racktop/go,roth1002/go,mwhudson/go,odeke-em/go,theif519/go,theif519/go,deft-code/go,codestation/go,theif519/go,odeke-em/go,Jordanzuo/go,derekmarcotte/go,cyberroadie/go,suncycheng/go,momchil-velikov/go,codestation/go,odeke-em/go,miolini/go,Samurais/go,roth1002/go,odeke-em/go,sndnvaps/go,linux-on-ibm-z/go,theif519/go,suncycheng/go,golang/go,odeke-em/go,odeke-em/go,Samurais/go,linux-on-ibm-z/go,Cofyc/go,ImJasonH/go,polyverse-security/go,kim-racktop/go,rachtsingh/gogojuice,Cofyc/go,golang/go,rachtsingh/gogojuice,Jordanzuo/go,CAFxX/go,ImJasonH/go,nawawi/go,mwhudson/go,suncycheng/go,goodlang/good,cyberroadie/go,roth1002/go,sndnvaps/go,sndnvaps/go,golang/go,josharian/go,deft-code/go,nawawi/go,roth1002/go,momchil-velikov/go,ganboing/go-esx,codestation/go,momchil-velikov/go,theif519/go,vanloswang/go,codestation/go,akutz/go,fjballest/golang,josharian/go,kim-racktop/go,fjballest/golang,cyberroadie/go,cyberroadie/go,josharian/go,nawawi/go,Endika/go,binarycrusader/go,deft-code/go,Samurais/go,cloudflare/go,momchil-velikov/go,cloudflare/go,theif519/go,miolini/go,Jordanzuo/go,4ad/go,4ad/go,fjballest/golang,mwhudson/go,Cofyc/go