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The contents of debug_pubnames and debug_pubtypes have been wrong since
Go 1.12.
CL golang.org/cl/137235 moved global variables DIE to their respective
compilation unit, unfortunately writepub can't emit correct sections
for anything but the first compilation unit.

This commit moves the code generating debug_pubnames and debug_pubtypes
inside writeinfo and fixes it.
Gets rid of a number of unnecessary relocations as well as a hack that
writeinfo used to communicate to writepub the size of each compilation
unit.

Fixes #30573

Change-Id: Ibdaa80c02746ae81661c2cfe1d218092c5ae9236
Reviewed-on: https://go-review.googlesource.com/c/go/+/165337


Run-TryBot: Alessandro Arzilli <alessandro.arzilli@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>