debug/elf: add many PT_ and DT_ constants
debug/elf: add many PT_ and DT_ constants

Change-Id: Icbb5a0f0ff4aa0a425aa4a15477da7bd0d58339c
Reviewed-on: https://go-review.googlesource.com/c/go/+/255138
Trust: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
Reviewed-by: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

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