Basic and debug tracing
This commit adds tracing for the OpenMP:
- parallel regions
- parallel functions
- task creation
- task exectution
- barrier
This commit also adds debug information in the trace in the form of an event whose value indicates the last called callback.
Co-authored-by: MIQUEL COMAS HERVADA miquel.comas@bsc.es Co-authored-by: JOAN VINYALS YLLA CATALA joan.vinyals@bsc.es