This patch adds a hidden command line option to enable predicated vectorization using VP intrinsics.
It is the 3rd patch in the series of patches to enable vector predication support (D99750).
A link to the VP intrinsics section in the LangRef would be nice.
This is a lot of text. Maybe restructure this to make clear what the default is right now (NoPredication), what the default should be in the future (IfAVLSupported) and mention the other two explicitly as experimental/test settings.