Revert "Revert "Hide symbols from the unwinder."" Bug: 18471342 Bug: 19958712 This reverts commit d3c786591b2e606d371c402bb3123fffbcbbb6ba. Change-Id: Ie0744c329241cf20b58c519c1bbbdc68e496e43d (cherry picked from commit 2ea633775bea94317c426da71f3782ce322389fd)