cmd/compile: add special case for testing first field of struct variable
The change to the write barrier in https://golang.org/cl/16899 means that the compiler now emits tests of the first field of a struct. That was using a register that was not used before. This change fixes that for amd64 by adding a special case for the first field of a struct. Update #12416. Change-Id: Ia57baa62cd741592fbeb9be82f1e846be73d6edd Reviewed-on: https://go-review.googlesource.com/16933 TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Russ Cox <rsc@golang.org>
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