[OpenMP][Tools][Tests] Fix ompt multiplex testWith 6213ed0 the master callback was renamed to masked.The multiplex tests must check for masked now.
[OpenMP][Tests] Fix/Mark compatibilty for GCCReviewed by: Hahnfeld, saiislamDifferential Revision: https://reviews.llvm.org/D82267
[OpenMP][Tool] Header-only multiplexing of OMPT toolsReviewed By: jdoerfertDifferential Revision: https://reviews.llvm.org/D76012