cmd/link: introduce and use peSection.checkOffset
cmd/link: introduce and use peSection.checkOffset

Change-Id: I093b79a8dd298bce8e8774c51a86a4873718978a
Reviewed-on: https://go-review.googlesource.com/56314
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

nawawi/go,polyverse-security/go,akutz/go,codestation/go,CAFxX/go,polyverse-security/go,christopher-henderson/Go,polyverse-security/go,codestation/go,josharian/go,Cofyc/go,josharian/go,Cofyc/go,codestation/go,akutz/go,CAFxX/go,josharian/go,Cofyc/go,polyverse-security/go,golang/go,akutz/go,Cofyc/go,golang/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,nawawi/go,cloudflare/go,josharian/go,golang/go,josharian/go,cloudflare/go,Cofyc/go,Cofyc/go,josharian/go,akutz/go,golang/go,nawawi/go,cloudflare/go,codestation/go,polyverse-security/go,Cofyc/go,josharian/go,cloudflare/go,polyverse-security/go,golang/go,josharian/go,cloudflare/go,nawawi/go,codestation/go,polyverse-security/go,codestation/go,nawawi/go,golang/go,CAFxX/go,akutz/go,CAFxX/go,CAFxX/go,CAFxX/go,golang/go,CAFxX/go,Cofyc/go,cloudflare/go,akutz/go,CAFxX/go,polyverse-security/go,akutz/go,golang/go,codestation/go,cloudflare/go,codestation/go,nawawi/go