Revert "go/types: enforce Check path restrictions via panics"
Revert "go/types: enforce Check path restrictions via panics"

This reverts commit b744a11a966ad3999c190fea9909ec8df0570b87.

Reason for revert: Broke trybots. (misc-vetall builder is busted)

Change-Id: I651d1c18db2fb3cb6ec12c2ae62024627baf8d77
Reviewed-on: https://go-review.googlesource.com/38332
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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