P3481 R2 - Incorporate changes from the "bulk issues" paper

[lucteo]

See http://wg21.link/P3481R2

Main changes:

• add bulk_chunked and bulk_unchunked
• bulk takes an additional execution policy
• bulk is specified in terms of bulk_chunked

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[lucteo]

@ericniebler : this is not yet ready, but I wanted to push it up, so that you have a chance to see it earlier.

I'm planning to change the schedulers (static_thread_pool, libdispatch, parallel_scheduler) to be customized in terms of bulk_unchunked.

I'm also expecting some issues on the CUDA sides; I'm not sure how can I move forward on that side. Any help is greatly appreciated.

[ericniebler]

/ok to test

[lucteo]

The GCC failure should be fixed. I'm not sure how to approach the Windows failure :(

[ericniebler]

/ok to test

[ericniebler]

@lucteo you can disregard the GPU CI failures. they are infra-related. the msvc failures are real though.

[lucteo]

@ericniebler : there are some issues on the GPU side as well caused by my patch. I will temporarily pause this for 2 weeks, as I need to finish my ACCU presentation for next week.

[ericniebler]

/ok to test

[ericniebler]

@lucteo i have addressed the GPU build problem. the msvc build failure remains.

[ericniebler]

/ok to test

[ericniebler]

/ok to test

[ericniebler]

/ok to test