Refactor to make transformExpr smaller
Refactor to make transformExpr smaller

ncave/Fable,fable-compiler/Fable,fable-compiler/Fable,inosik/Fable,inosik/Fable,fable-compiler/Fable,fable-compiler/Fable,ncave/Fable,ncave/Fable,ncave/Fable,ncave/Fable,fable-compiler/Fable,ncave/Fable,fable-compiler/Fable,ncave/Fable,fable-compiler/Fable