swift234

Remove the use of the 'Playground' language option for non-playground things.

LLDB has been setting 'Playground' for their REPL mode too to get some of
these behaviors, but that's not something we want to do long-term, and it's
already been subtly wrong in a few cases. Now 'Playground' really does mean
playgrounds, and 'DebuggerSupport' means REPL /or/ LLDB expression parser
mode.

rdar://problem/18338200

Swift SVN r22030