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As far as I can tell, both of these flags just mean "respect
symbol_level when sanitizers are enabled". This change makes it so
that we always do that, removing the need for both flags. Because
the default symbol level is 1 in sanitizer builds, we still get -g1
(which is equivalent to -gline-tables-only) by default. Users can
now adjust the symbol level simply by setting symbol_level.

Change-Id: Ied9f589c268e7e5c625b4cce46d76e51452e473b
Reviewed-on: https://chromium-review.googlesource.com/1156125Reviewed-by: Oliver Chang <ochang@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579330}