Roll buildtools/third_party/libc++abi/trunk/ 665b74f7d..2715a6c0d (7 commits)

https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxxabi.git/+log/665b74f7d1b3..2715a6c0de8d

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

Change-Id: I1b4523065cee58b4081389d3688cd63da033b6a5
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/88695
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 6544ade..1c8d84d 100644
--- a/DEPS
+++ b/DEPS
@@ -100,7 +100,7 @@
   # 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': '665b74f7d1b3bb295cd6ba7d8fcec1acd3d2ac84',
+  'libcxxabi_revision': '2715a6c0de8dac4c7674934a6b3d30ba0c685271',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libunwind
   # and whatever else without interference from each other.