Code cleanup / Cycles:
* Change some more if / else if conditions to switch / case. 
* Avoid an unneeded variable casting in phong_ramp closure. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56659 954f8c5b-7b00-dc11-b283-0030488c597c