swift

ef3298e4 - [docs] Add some information to DebuggingTheCompiler.md about working with the various simulators.

[docs] Add some information to DebuggingTheCompiler.md about working with the various simulators. I am adding this since I had to go spelunking around to find the SIMCTL_CHILD_ prefix which I need to debug an app. Rather than just forgetting it again, I thought it made sense to just document it here so I can forget it again. I also put in a little bit of other stuff about simctl as well while I was here.