[Issue 18235] Group logically similar tests into the same module in the D2 testsuite

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18235

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
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                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg

--- Comment #2 from moonlightsentinel at disroot.org ---
Grouping test files doesn't achieve much in regard to the general test
execution time. The real time sink are the permutations for DMD's
optimizer/inliner (compare `./run.d` with `./run.d quick`)

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