runtime: test VDSO symbol hash values

runtime: test VDSO symbol hash values

In addition to verifying existing values, this makes it easier to add a
new one by adding an invalid entry and running the test.

Change-Id: I6a6a636c9c413add29884e4f6759196f4db34de7
Reviewed-on: https://go-review.googlesource.com/c/go/+/693276
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>