swift234

SIL: Avoid tupling one-argument function arguments
SILGenExpr has special case logic to avoid constructing a SIL tuple for function arguments, but this logic failed to cover single-argument functions, in which the argument AST goes through a ScalarToTupleExpr node rather than a TupleExpr node. This patch adds similar logic to the ScalarToTupleExpr case so that single function arguments don't go through a SIL tuple instruction.

Swift SVN r3281