[Issue 18411] New: Split up std.internal.regex.tests.d into multiple files or runs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18411

          Issue ID: 18411
           Summary: Split up std.internal.regex.tests.d into multiple
                    files or runs
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

tl;dr: auto-tester only uses 2GB of memory, but the tests from std.regex often
require more and thus lead to spurious failures.

https://github.com/braddr/d-tester/issues/66
https://github.com/braddr/d-tester/issues/69

In lack of being able to make DMD consume less memory easily, imho the best
solution for now is to splitup the tests.d file.

Existing work:
- https://github.com/dlang/phobos/pull/6061

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