[fpc-pascal] Constants in generics

[Sven Barth]

Am 07.01.2019 um 02:05 schrieb Ryan Joseph:
> I updated the github with the requested changes. Is that everything? I’ll submit a patch if so.
>
> https://github.com/genericptr/freepascal/tree/generic_constants
Looks better.

The following points remain:
- make sure that you don't have any unrelated changes (just look at all 
the completely unrelated changes in this commit 
https://github.com/genericptr/freepascal/commit/bd76667453914106a51d31672d841b1344066e6a 
)
- make sure that the code you added follows the compiler's formatting 
(there are quite some locations where you have spaces between 
identifiers and operators)
And most importantly:
- add tests: both for successful compilations as well as ones that 
should fail (though everything that produces an error needs to be its 
own test); I suggest tests/test/tgenconst*.pp as a name (for more infos 
you can look at http://wiki.freepascal.org/Testing_FPC )

You should also make sure that your changes don't break anything, so you 
should run the testsuite once without your changes, save 
tests/output/<cpu>-<os>/{faillog,log,longlog} and then run the testsuite 
again with your changes and compare especially faillog (see 
http://wiki.freepascal.org/Testing_FPC#Recommended_Workflow ).

Regards,
Sven