regression test for Issue 13774
Merge pull request #4188 from MartinNowak/fix13774

regression test for Issue 13774
[Refactoring] Tweak code style in interpreter
[Refactoring] A small code flow improvement in AndAndExp and OrOrExp
[Refactoring] Clean up statement interpretation
Merge pull request #4189 from 9rnsr/refactor_ctfe

[Refactoring] improve CTFE interpreter code