Merge: temporarily add initializers for nonescapable unit tests

This is needed until initializer inference is merged. Then these extra
initializers can simply be deleted.

Author: atrick

test/SIL/type_lowering_unit.sil

@@ -120,6 +120,9 @@ extension GSNC: Copyable where T: Copyable  {}
 
 struct GSNE<T: ~Escapable>: ~Escapable {
     var x: T
+
+    // 60_MERGE: an explicit initializer is temporarily required until initializer inferrence is merged.
+    init(x: consuming T) { self.x = x }
 }
 
 extension GSNE: Escapable where T: Escapable {}

test/SILGen/typelowering_inverses.swift

@@ -139,7 +139,10 @@ func check(_ t: inout any NoEscapeP & ~Escapable) {}
 // MARK: conditionally Copyable & Escapable SILGen
 
 struct MyStruct<T: ~Copyable & ~Escapable>: ~Copyable & ~Escapable {
-    var x: T
+  var x: T
+
+  // 60_MERGE: an explicit initializer is temporarily required until initializer inferrence is merged.
+  init(x: consuming T) { self.x = x }
 }
 
 extension MyStruct: Copyable where T: Copyable & ~Escapable {}