gdb_index is not in declare_args() and has no effect.

NOTRY=true

Change-Id: I88a9558937aa8fea30ab246899bea4a123947f82
Reviewed-on: https://chromium-review.googlesource.com/475772
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44620}