tests/fixedbugs: make test for issue11656 run known instruction
tests/fixedbugs: make test for issue11656 run known instruction

As detailed in #11910, the current implementation attempts to execute an area
of memory with unknown content. If the memory is executable, the result is
unpredictable - instead, make the test deterministic by attempting to execute
an instruction that is known to trigger a trap on the given architecture.

The new implementation is written by iant@ and provided via #11910.

Update issue #11910

Change-Id: Ia698c36e0dd98a9d9d16a701f60f6748c6faf896
Reviewed-on: https://go-review.googlesource.com/15058
Run-TryBot: Joel Sing <55495163370d1a3b8fc0c7106120704aaf8de7f9@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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