The workarounds doesn't seem necessary anymore, and blocks DWARF
on darwin/arm64.

Updates #24883.

Change-Id: Ic917c767d3b4f6c51be25566956296f5dd4ead10
Reviewed-on: https://go-review.googlesource.com/108655
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>