swift234

Modifying the playround  transform to support logging
of statements like "x += y".  This involved two changes:

 - Where we previously only treated CallExprs as function
   calls, now we instead look at ApplyExprs.  This covers
   cases like this += call, which is actually a BinaryExpr.

 - For all such Exprs, if there is exactly one inout
   argument and the Expr returns void, log that argument.

<rdar://problem/16609821>


Swift SVN r17046