[stdlib] Generalize MemoryLayout for ~Escapable types

Author: lorentey

stdlib/public/core/MemoryLayout.swift

@@ -40,9 +40,10 @@
 ///             byteCount: count * MemoryLayout<Point>.stride,
 ///             alignment: MemoryLayout<Point>.alignment)
 @frozen // namespace
-public enum MemoryLayout<T: ~Copyable>: ~BitwiseCopyable, Copyable {}
+public enum MemoryLayout<T: ~Copyable & ~Escapable>
+: ~BitwiseCopyable, Copyable, Escapable {}
 
-extension MemoryLayout where T: ~Copyable {
+extension MemoryLayout where T: ~Copyable & ~Escapable {
   /// The contiguous memory footprint of `T`, in bytes.
   ///
   /// A type's size does not include any dynamically allocated or out of line
@@ -81,7 +82,7 @@ extension MemoryLayout where T: ~Copyable {
   }
 }
 
-extension MemoryLayout where T: ~Copyable {
+extension MemoryLayout where T: ~Copyable & ~Escapable {
   /// Returns the contiguous memory footprint of the given instance.
   ///
   /// The result does not include any dynamically allocated or out of line