detab on runnable/testenum.d
fix Issue 9845 - enum value should be able to contain forward references in global scope
fix Issue 9846 - regression of forward references
fix Issue 7719 - enum forward reference error when enum is in braces
Merge pull request #1821 from 9rnsr/fix9845

Issue 7719,9845,9846 - fix anonymous enum and forward reference problems