[release-branch.go1.22] cmd/link: handle dynamic import variables on Darwin in plugin mode

CL 501855 added support for cgo_dynamic_import variables on Darwin.
But it didn't support the plugin build mode on amd64, where the
assembler turns a direct load (R_PCREL) to a load via GOT
(R_GOTPCREL). This CL adds the support. We just need to handle
external linking mode, as this can only occur in plugin or shared
build mode, which requires external linking.

Fixes #68122.
Updates #67976.
Updates #50891.

Change-Id: I0f56265d50bfcb36047fa5538ad7a5ec77e7ef96
Reviewed-on: https://go-review.googlesource.com/c/go/+/592499
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit 44f18706661db8b865719d15a5cfa0515d1a4fca)
Reviewed-on: https://go-review.googlesource.com/c/go/+/595175
Reviewed-by: Joedian Reid <joedian@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
3 files changed
tree: fcd9628f2c958b97a06985b58c8b2bc2bb6eed73
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
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