cmd/compile: ensure that knownFormats is up to date
cmd/compile: ensure that knownFormats is up to date

Change-Id: I4febdddfe5be569a8bba0a4cddf52dec7f1be1bf
Reviewed-on: https://go-review.googlesource.com/32930
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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