[OMPT] Fix test parallel/not_enough_threads.c
[OMPT] Fix test parallel/not_enough_threads.c

Upcoming changes to FileCheck will modify CHECK-DAG to not match
overlapping regions of the input. This test was found to be affected
because it expects to find four threads to invoke events of type
ompt_event_implicit_task_begin. It turns out this is wrong because
OMP_THREAD_LIMIT is set to 2, so there are only two threads. The
rest of the test got it right so it went unnoticed until now.

(Rewrite test and apply clang-format to it as discussed in the past.)

Differential Revision: https://reviews.llvm.org/D47119

git-svn-id: f99161ee8ccfe2101cbe1bdda2220bce2ed25485@333361 91177308-0d34-0410-b5e6-96231b3b80d8

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