Replaced TIntermLoop::testFirst with TIntermLoop::loopType to clearly indicate which type of loop it is. In some cases it is not possble to differentiate between a for-loop and while-loop.
BUG=48
Review URL: http://codereview.appspot.com/3123041

git-svn-id: https://angleproject.googlecode.com/svn/trunk@482 736b8ea6-26fd-11df-bfd4-992fa37f6226