man page: add a description of -m flag
man page: add a description of -m flag

-m flag is used to switch the merging thread context (a.k.a recycling context)

The flag description is mentioned in hpcrun -h, but missing in the man page.

HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit