Roll buildtools/third_party/libunwind/trunk/ e5a9c50e5..a321409e6 (5 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/e5a9c50e5e0b..a321409e66c2

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

Change-Id: I7d3cb5281a163f594fba28d3e6ba193ec53651e3
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/111578
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 547b720..157a497 100644
--- a/DEPS
+++ b/DEPS
@@ -136,7 +136,7 @@
   # 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': 'e5a9c50e5e0b620a8886df1c4677b12404620fb6',
+  'libunwind_revision': 'a321409e66c212098e755cfae1a978bbcff1ccbb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling markupsafe
   # and whatever else without interference from each other.