[PATCH] D95542: [scudo][standalone] Restore GWP-ASan flag parsing

[Kostya Kortchinsky via Phabricator via llvm-commits]

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With D92696 <https://reviews.llvm.org/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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95542

Files:
  compiler-rt/lib/scudo/standalone/CMakeLists.txt
  compiler-rt/lib/scudo/standalone/combined.h
  compiler-rt/lib/scudo/standalone/flags.cpp
  compiler-rt/lib/scudo/standalone/flags_parser.h
  compiler-rt/lib/scudo/standalone/tests/CMakeLists.txt
  compiler-rt/lib/scudo/standalone/tests/flags_test.cpp
  compiler-rt/test/scudo/standalone/unit/lit.site.cfg.py.in

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