cmd/link: emit correct jump instruction on ARM for DYNIMPORT
On ARM, for a JMP/CALL relocation, the instruction bytes is
encoded in Reloc.Add (issue #19811). I really hate it, but before
it is fixed we have to follow the rule and emit the right bits
from r.Add.
Fixes #40769.
Change-Id: I862e105408d344c5cc58ca9140d2e552e4364453
Reviewed-on: https://go-review.googlesource.com/c/go/+/248399 Reviewed-by: Jeremy Faller <jeremy@golang.org> Reviewed-by: Joel Sing <joel@sing.id.au> Reviewed-by: Than McIntosh <thanm@google.com>