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[perf-training] Make training data location configurable

Authored by smeenai on Dec 13 2019, 7:35 PM.

Description

[perf-training] Make training data location configurable

We may wish to keep the PGO training data outside the repository. Add a
CMake variable to allow referencing an external lit testsuite.

Differential Revision: https://reviews.llvm.org/D71507

Details