[Refactoring] Share FuncDeclaration for _aaLen
fix Issue 12214 - AA.length is not nothrow
Don't put comments inside if conditions
Merge pull request #3305 from 9rnsr/fix12214

[REG-head] Issue 12214 - AA.length is not nothrow
Merge pull request #3314 from yebblies/condcomment2

[DDMD] Don't put comments inside if conditions