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[scudo][standalone] Restore GWP-ASan flag parsing

Authored by cryptoad on Jan 27 2021, 9:54 AM.

Description

[scudo][standalone] Restore GWP-ASan flag parsing

With D92696, the Scudo Standalone GWP-ASan flag parsing was changed to
the new GWP-ASan optional one. We do not necessarily want this, as this
duplicates flag parsing code in Scudo Standalone when using the
GWP-ASan integration.

This CL reverts the changes within Scudo Standalone, and increases
MaxFlags to 20 as an addionnal option got us to the current max.

Differential Revision: https://reviews.llvm.org/D95542