Roll buildtools/third_party/libc++abi/trunk/ b2e8ad275..8d21803b9 (4 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi.git/+log/b2e8ad2755f1..8d21803b9076

Created with:
  roll-dep buildtools/third_party/libc++abi/trunk

Change-Id: I318369d18ca0e254f2f8af6769ee723de8391552
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/109276
Auto-Submit: K. Moon <kmoon@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Commit-Queue: Nigi <nigi@chromium.org>
diff --git a/DEPS b/DEPS
index 2d25f35..4a8e282 100644
--- a/DEPS
+++ b/DEPS
@@ -116,7 +116,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libc++abi
   # and whatever else without interference from each other.
-  'libcxxabi_revision': 'b2e8ad2755f15556a2e93b500db665c25409b95e',
+  'libcxxabi_revision': '8d21803b9076b16d46c32e2f10da191ee758520c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libpng
   # and whatever else without interference from each other.