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Leaves the implementation and tests files in-place for right now, but deletes the ability to build the old sanitizer-common based scudo. This has been on life-support for a long time, and the newer scudo_standalone is much better supported and maintained. Also patches up some GWP-ASan wording, primarily related to the fact that -fsanitize=scudo now is scudo_standalone, and therefore the way to reference the GWP-ASan options through the environment variable has changed. Future follow-up patches will delete the original scudo, and migrate all its tests over to be part of the scudo_standalone test suite. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D138157