Roll buildtools/third_party/libunwind/trunk/ bbcbce996..393e3eee9 (8 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/bbcbce996866..393e3eee998d

Created with:
  roll-dep buildtools/third_party/libunwind/trunk

Change-Id: Ibd0a631be93ca961e6e083f9efe4df8b3a79267f
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93278
Commit-Queue: Nigi <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 166d7a8..f4254cf 100644
--- a/DEPS
+++ b/DEPS
@@ -107,7 +107,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libunwind
   # and whatever else without interference from each other.
-  'libunwind_revision': 'bbcbce996866ff1f947414a8d9db1e79bdc7dca2',
+  'libunwind_revision': '393e3eee998d163753894939ab574dc57b08c7f3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling markupsafe
   # and whatever else without interference from each other.