Adding Swift 3 alias for _SignedInteger

Max Moiseev · Max Moiseev · commit 71b2c1fb41b9 · 2017-04-17T11:01:59.000-07:00
diff --git a/stdlib/public/core/Integers.swift.gyb b/stdlib/public/core/Integers.swift.gyb
@@ -3528,6 +3528,9 @@ public typealias SignedNumber = SignedNumeric
 @available(swift, obsoleted: 4)
 public typealias AbsoluteValuable = SignedNumeric & Comparable
 
+@available(swift, obsoleted: 4)
+public typealias _SignedInteger = SignedInteger
+
 extension SignedNumeric where Self : Comparable {
   @available(swift, obsoleted: 4)
   @_transparent
