[5.0] Fix SR-6837 - allow function conversion for -swift-version 4 *only* #14457
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We inadvertantly allowed a function conversion for Swift 4 that we did
not intend to allow.
This commit adds an extremely narrow fix to continue to allow this for
-swift-verson 4 only.
Fixes rdar://problem/36875195 / https://bugs.swift.org/browse/SR-6837
(cherry picked from commit 1de9897)