Roll third_party/libunwind/src/ 81e2cb40a..e3eb847e5 (6 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/81e2cb40a70d..e3eb847e5178

Created with:
  roll-dep third_party/libunwind/src

Change-Id: I4bbed8962c7e49180e5f5804a1fbde098a326689
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/132851
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 7392b66..a5c3964 100644
--- a/DEPS
+++ b/DEPS
@@ -172,7 +172,7 @@
   # 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': '81e2cb40a70de2b6978e6d8658891ded9a77f7e3',
+  'libunwind_revision': 'e3eb847e517898924d0ae70ff4266b97908b8b7b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling llvm-libc
   # and whatever else without interference from each other.