Re: [gomp4.1] fix more scheduling inconsistencies and add verification routines

[Aldy Hernandez <aldyh at redhat dot com>]

As per our IRC discussion.

I am conditionally compiling the verification code because you mentioned 
that the GPGPUs may not having a working printf.

Also, I removed the code caching the workgroup since it may contain the 
incorrect workgroup as I had suggested.  Now instead we look in 
child_task->taskgroup which will have the correct workgroup always.

Tested on x86-64 Linux with make check-target-libgomp for a variety of 
different OMP_NUM_THREADS and with _ENABLE_LIBGOMP_CHECKING_ set to 1.

OK for branch?

p.s. As a thought, maybe we can set _ENABLE_LIBGOMP_CHECKING_ to 1 until 
release?

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