[OpenMP] [OMPT] [1/8] Create separate categories for host, device, [no]emi events

In preparation for OMPT target changes, create separate categories of events that will be used by OMPT target support.

Split up existing macro FOREACH_OMPT_EVENT into new ones. There is no change to the original macro. Created new macros FOREACH_OMPT_HOST_EVENT, FOREACH_OMPT_DEVICE_EVENT, FOREACH_OMPT_NOEMI_EVENT, FOREACH_OMPT_EMI_EVENT, and a few other sub-categories that can be used as required. One such use is in D123974 which uses events selectively.

Patch from John Mellor-Crummey <johnmc@rice.edu>

Reviewed By: dreachem

Differential Revision: https://reviews.llvm.org/D123429