Mark de Wever e8e8707b4a Revert "Reland "[CMake] Bumps minimum version to 3.20.0.""
Unfortunatly not all buildbots are updated.

This reverts commit ffb807ab5375b3f78df198dc5d4302b3b552242f.
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Polly - Polyhedral optimizations for LLVM
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http://polly.llvm.org/

Polly uses a mathematical representation, the polyhedral model, to represent and
transform loops and other control flow structures. Using an abstract
representation it is possible to reason about transformations in a more general
way and to use highly optimized linear programming libraries to figure out the
optimal loop structure. These transformations can be used to do constant
propagation through arrays, remove dead loop iterations, optimize loops for
cache locality, optimize arrays, apply advanced automatic parallelization, drive
vectorization, or they can be used to do software pipelining.