Roll third_party/libunwind/src/ e3eb847e5..634c60974 (3 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libunwind.git/+log/e3eb847e51789..634c609746c6

Change-Id: I39763c1f2c2fbb04ad37a3cd712bd11f5a800016
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/133970
Auto-Submit: Andy Phan <andyphan@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Andy Phan <andyphan@chromium.org>
diff --git a/DEPS b/DEPS
index 22ac31d..a94bbfb 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': 'e3eb847e517898924d0ae70ff4266b97908b8b7b',
+  'libunwind_revision': '634c609746c6ce2d731a4e6f6285135bd84bd3a3',
   # 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.