syscall: add more TestGetfsstat debugging
syscall: add more TestGetfsstat debugging

Updates #16937

Change-Id: I6d1b210c741269b58040bd68bf3b51644f891737
Reviewed-on: https://go-review.googlesource.com/28487
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>

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