Merge "Don't discard the result of std::unique" into main am: d0210ae77c

Original change: https://android-review.googlesource.com/c/platform/external/clang/+/2755601

Change-Id: Ieebd0485e830289ce72222b9f57c470792c471a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>