Roll libcxxabi from c884e7a7ce67 to a0ace9923ef5 (1 revision)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi.git/+log/c884e7a7ce67..a0ace9923ef5

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

If this roll has caused a breakage, revert this CL and stop the roller
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https://autoroll.skia.org/r/libcxxabi-chromium
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is aware of the problem.

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Tbr: hans@chromium.org,thakis@chromium.org
Change-Id: I4db3015bce4fec486de3e8e0453dbe764a84634a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3374004
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