runtime: support DT_GNU_HASH in VDSO Currently we only support finding symbols in the VDSO using the old DT_HASH. These days everything uses DT_GNU_HASH instead. To keep up with the times and future-proof against DT_HASH disappearing from the VDSO in the future, this commit adds support for DT_GNU_HASH and prefers it over DT_HASH. Tested by making sure it found a DT_GNU_HASH section and all of the expected symbols in it, and then disabling the DT_GNU_HASH path and making sure the old DT_HASH path still found all of the symbols. Fixes #19649. Change-Id: I508c8b35a019330d2c32f04f3833b69cb2686f13 Reviewed-on: https://go-review.googlesource.com/45511 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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