Roll buildtools/third_party/libunwind/trunk/ c936d73ff..4ead61094 (6 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/c936d73ff70e..4ead61094cab

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

Change-Id: I41e7da21f97404f3f81b5fc01d4bdd7a40d48c18
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/88694
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 609c8fd..6544ade 100644
--- a/DEPS
+++ b/DEPS
@@ -104,7 +104,7 @@
   # 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': 'c936d73ff70ebf755c8fee3f3420dd16805e377a',
+  'libunwind_revision': '4ead61094cab5ac7a90198fbe182596c4775183e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling markupsafe
   # and whatever else without interference from each other.