[dev.link] cmd/link: add PPC64 section splitting test
Add a new PPC64-only linker test that does a build with the
-debugppc64textsize debugging option (selecting a lower the threshold
for text section splitting) to verify that no bugs have been
introduced in the linker code that manages this process.
Change-Id: Iea3f16a04c894d528eab2cb52f1ec1d75a2770cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/241499
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jeremy Faller <jeremy@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>