Fix symbol visibility in fake overlays

Stronger assertions are coming which will trigger if these
are defined as internal.

Author: slavapestov

test/Inputs/clang-importer-sdk/swift-modules-without-ns/ObjectiveC.swift

@@ -61,11 +61,11 @@ public struct NSZone {
   public var pointer : OpaquePointer
 }
 
-internal func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool {
+public func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool {
   return ObjCBool(x)
 }
 
-internal func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool {
+public func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool {
   return x.boolValue
 }
 

test/Inputs/clang-importer-sdk/swift-modules/ObjectiveC.swift

@@ -75,11 +75,11 @@ public struct NSZone {
   public var pointer : OpaquePointer
 }
 
-internal func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool {
+public func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool {
   return ObjCBool(x)
 }
 
-internal func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool {
+public func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool {
   return x.boolValue
 }
 

test/SILGen/Inputs/ObjectiveC.swift

@@ -12,10 +12,10 @@ public struct ObjCBool {
 }
 
 @_silgen_name("swift_BoolToObjCBool")
-func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool
+public func _convertBoolToObjCBool(_ x: Bool) -> ObjCBool
 
 @_silgen_name("swift_ObjCBoolToBool")
-func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool
+public func _convertObjCBoolToBool(_ x: ObjCBool) -> Bool
 
 
 public struct Selector : ExpressibleByStringLiteral {