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[test-suite] Add cmake option to use IR PGO (TEST_SUITE_USE_IR_PGO)

Description

[test-suite] Add cmake option to use IR PGO (TEST_SUITE_USE_IR_PGO)

This allows building programs in the test suite with LLVM's IR PGO
feature. Support for re-building programs with the collected profdata is
already present.

Differential Revision: https://reviews.llvm.org/D57985