debug/elf: retrieve values for dynamic section tags
Add functionality to retrieve values for .dynamic entries that don't
correspond to entries in the string table.
Fixes #56892
Change-Id: I6edabc8ca331c819e442d06e19b7f4df8343372b
Reviewed-on: https://go-review.googlesource.com/c/go/+/452617
Auto-Submit: Ian Lance Taylor <iant@google.com>
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