[RFC] Test coverage for --param boundary values

[Martin Liška]

Hello.

As I already briefly discussed my attempt with Jakub, it would be interesting to provide
compile tests that would cover boundary values of params.
That revealed e.g. PR rtl-optimization/71634 and many similar.

The crucial part of the patch is selection of a proper source file that would expose boundary
values. Second question is what optimization level to pick up as a base level.

My initial attempt is nanojpeg ([1]), which is a single file implementation of JPEG compression/decompression
algorithm. Well, testing all boundary values takes 3m20s on i7 machine (it's single-threaded) and it introduces
232 new PASSes.

Thoughts?
Thanks,
Martin

[1] http://keyj.emphy.de/nanojpeg/

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