[Refactoring] Remove unused variable evaluatingArgs
[Refactoring] reduce code indent depth
CTFE: paintTypeOntoLiteral() to UnionExp
Merge pull request #4166 from WalterBright/paintliteral

CTFE: paintTypeOntoLiteral() to UnionExp
Merge pull request #4165 from 9rnsr/refactor_ctfe

[Refactoring] Reduce code indent depth in CTFE interpreter