pull out some helper methods for visitRaise in mirah typer
pull out some helper methods for visitRaise in mirah typer

the typer code is pretty dense. I'm planning on doing some refactorings along these lines to make the visit* methods easier to scan

aspleenic/mirah,uujava/mirah,felixvf/mirah,aspleenic/mirah,mirah/mirah,KeenS/mirah,uujava/mirah,mirah/mirah,uujava/mirah,felixvf/mirah,KeenS/mirah,felixvf/mirah,mirah/mirah,uujava/mirah,aspleenic/mirah,KeenS/mirah,uujava/mirah,mirah/mirah,aspleenic/mirah,aspleenic/mirah,KeenS/mirah,felixvf/mirah