Roll libunwind from 4bf418ebaf3e to 58d16473609e (1 revision)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/4bf418ebaf3e..58d16473609e

2022-01-08 bungeman@chromium.org [libc++] Disable coverage with sanitize-coverage=0

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Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: I31bb6bf62f32e358d9df74ee3edd6dca3c5e5fd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3374005
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