[release-branch.go1.17] debug/pe,debug/macho: add support for DWARF5 sections

Adds the same logic used in debug/elf to load DWARF5 sections.

For #49590
Fixes #50722

Change-Id: Iee05b9927a6f521842b330eab8942ade3fc2bd86
Reviewed-on: https://go-review.googlesource.com/c/go/+/363895


Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Than McIntosh <thanm@google.com>
(cherry picked from commit 6c36c332)
Reviewed-on: https://go-review.googlesource.com/c/go/+/379914


Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>