Roll libunwind from d6f21e01ceaa to 7846d256355e (1 revision)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/d6f21e01ceaa..7846d256355e

2021-05-08 ldionne.2@gmail.com [libc++] Move handling of the target triple to the DSL

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

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Tbr: thakis@chromium.org,rnk@chromium.org
Change-Id: I525bf1d995e3bce541a5e48c2c3adb7291b36371
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2881126
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#880740}

DEPS

@@ -376,7 +376,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'libunwind_revision':    'd6f21e01ceaa70347605dbce8cc3b95b3fab9462',
+  'libunwind_revision':    '7846d256355e40273f7cc192c8f5893e8665a1f9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.