Accept a non-empty vdso name in linux/debug_rendezvous_test
Accept a non-empty vdso name in linux/debug_rendezvous_test

Some versions of glibc (e.g., Debian GLIBC 2.24-11+deb9u1) do set a name
for the vdso mapping.

Change-Id: I342a55e95f649d5aaf1e35f1afab53d89f4ba0fc
Reviewed-on: https://chromium-review.googlesource.com/679858
Commit-Queue: Dave Bort <5d60646f2fc125338db5820323ce80f912815276@google.com>
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Reviewed-by: Joshua Peraza <f5809a5e35ec7e1bd0e25cb0a0b68bb433cf6f17@chromium.org>

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