swift234

[Parse] Attach 'inout' to Swift 2 unparenthesized function params. (#4241)

This syntax is no longer permitted, but we need to parse it like Swift
2 did in order to produce the fix-it that matches Swift 2 behavior.

rdar://problem/26681485
(cherry picked from commit 294bbd8e17c5893514599e52d02a37ce4e9ae24d)