stdlib: replace an obsolete initialize function in UnsafeBufferPointer.swapAt with the new one. (#16270)

eeckstein · airspeedswift · commit c2cc3ee6cfd9 · 2018-05-01T10:48:32.000-07:00
This brings back performance on stdlib sort because the obsoleted function in UnsafePointer is not inlinable.
diff --git a/stdlib/public/core/UnsafeBufferPointer.swift.gyb b/stdlib/public/core/UnsafeBufferPointer.swift.gyb
@@ -361,7 +361,7 @@ extension Unsafe${Mutable}BufferPointer: ${Mutable}Collection, RandomAccessColle
     let pj = (_position! + j)
     let tmp = pi.move()
     pi.moveInitialize(from: pj, count: 1)
-    pj.initialize(to: tmp, count: 1)
+    pj.initialize(to: tmp)
   }
 % end # mutable
 }

Original file line number	Diff line number	Diff line change
`@@ -361,7 +361,7 @@ extension Unsafe${Mutable}BufferPointer: ${Mutable}Collection, RandomAccessColle`
`361`	`361`	`let pj = (_position! + j)`
`362`	`362`	`let tmp = pi.move()`
`363`	`363`	`pi.moveInitialize(from: pj, count: 1)`
`364`		`- pj.initialize(to: tmp, count: 1)`
	`364`	`+ pj.initialize(to: tmp)`
`365`	`365`	`}`
`366`	`366`	`% end # mutable`
`367`	`367`	`}`