[OMPT] Resolve warnings because of ints in if conditions

The implementation status can only be one of
ompt_event_UNIMPLEMENTED = ompt_set_never = 1
ompt_event_MAY_ALWAYS = ompt_set_always = 5

In both cases, the condition was already true, so just remove
the check.

Differential Revision: https://reviews.llvm.org/D65869

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@369001 91177308-0d34-0410-b5e6-96231b3b80d8