Turn a function internal to preemptively avoid conflict

Author: trentxintong

stdlib/public/core/Prespecialized.swift

@@ -89,7 +89,10 @@ struct _Prespecialize {
   }
 }
 
-public func _swift_forcePrespecializations() {
+// Mark with optimize.sil.never to make sure its not get
+// rid of by dead function elimination. 
+@_semantics("optimize.sil.never")
+internal func _swift_forcePrespecializations() {
   _Prespecialize._specializeArrays()
   _Prespecialize._specializeRanges()
 }