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* Reland "Roll Clang to v11, roll buildroot to fe13f79dce4ce9aab3209f11988d825dcf580b4a, allow newly exported symbols (#17440)" (#17451)" This reverts commit a870bc53. * skip golden that is different on macos * buildroot to 1bc40a5f916adb93d87e2a2230a0ec43db876c1c