Use location type parameter in `Friendly.t` consistently
Use location type parameter in `Friendly.t` consistently

Summary: In practice this is instantiated to `Loc.t` (see just a few lines below in this file).

Reviewed By: dsainati1

Differential Revision: D10226940

fbshipit-source-id: 2c09b6a4ff981b26a4138fa94d3bc843cf88125d

mroch/flow,samwgoldman/flow,mroch/flow,facebook/flow,mroch/flow,samwgoldman/flow,facebook/flow,AgentME/flow,jamesgpearce/flow,popham/flow,facebook/flow,jamesgpearce/flow,jamesgpearce/flow,samwgoldman/flow,popham/flow,jamesgpearce/flow,jamesgpearce/flow,gabelevi/flow,jamesgpearce/flow,facebook/flow,mroch/flow,AgentME/flow,samwgoldman/flow,AgentME/flow,gabelevi/flow,gabelevi/flow,gabelevi/flow,facebook/flow,samwgoldman/flow,popham/flow,facebook/flow,samwgoldman/flow,gabelevi/flow,AgentME/flow,facebook/flow,mroch/flow,popham/flow,AgentME/flow,gabelevi/flow,mroch/flow,popham/flow,jamesgpearce/flow,gabelevi/flow,samwgoldman/flow,popham/flow,mroch/flow,popham/flow