Add STREAM benchmark

[bernhardmgruber]

This adds a copy of the STREAM benchmark from https://www.cs.virginia.edu/stream/. I added a LLAMA version of the various benchmarks as well. Using a custom non-temporal store accessor, LLAMA outperforms the compiler generated versions.

[codecov]

Codecov Report

Merging #643 (92ebb92) into develop (92ebb92) will not change coverage.
The diff coverage is n/a.

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Additional details and impacted files

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