[SR-2009] Implement SE-0111: Remove type system significance of function argument labels

[lattner]

Previous ID	SR-2009
Radar	rdar://problem/27175118
Original Reporter	@lattner
Type	Task

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Task, TypeChecker
Assignee	None
Priority	Medium

md5: f9596fe2756d513007f52b6171961b8e

Issue Description:

SE-0111 has been accepted, now we need an implementation.

[Dante-Broggi]

I think SE-0111 is marked as "Implemented in Swift 3", thus this report should be closed.

[yo1995]

@austinzheng is it possible to find someone to close this issue? Thanks.