[dev.link] cmd/link: resolve ABI aliases for external symbols
ABI alias references in Go symbols are resolved during loadObjFull. But for external symbols they are not resolved. If there is a reference from an external symbol to a Go ABIInternal symbol, this reference will be invalid as it is not resolved. The old code resolve ABI aliases in the deadcode pass. But the new deadcode pass doesn't do it, as it works with indices instead of Symbols. We do this in LoadFull. This makes all internal cgo linking tests pass on Mach-O. Change-Id: Iac6c084c03f5ddbcc9455527800ce7ed7313f9a7 Reviewed-on: https://go-review.googlesource.com/c/go/+/204698 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>
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