swift234

SILGen: Support ClosureExprs.
ClosureExprs mostly share the same logic as FuncExprs, but need a bit extra help to handle the implicit return from the body expression. Genericize some FuncExpr code to work with an arbitrary CapturingExpr or to accept body and param patterns separately so they can be passed the components of FuncExprs or ClosureExprs.

Swift SVN r3376