add function interface for hpcrun debugging this change enables limited debugging even if hpctoolkit isn't compiled with with --enable-develop
add function interface for hpcrun debugging
this change enables limited debugging even if hpctoolkit isn't compiled with with --enable-develop

two new functions:
  hpcrun_wait: waits for a debugger to attach
  hpcrun_continue: debugger calls this function to release a process spinning in hpcrun_wait

NOTE: the variable HPCRUN_DEBUGGER_WAIT can still be unset manually.

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