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Most Chrome unwinding failures can be correctly handled bu applying the
default step (using lr) when no cfi is present at the top of stack.

Change-Id: I0349688dcafa3973f1f77f230660312a4140dc19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2381730
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803496}