make Option.fromNullable extension method inline so it can be used outside the compiler

Author: olhotak

library/src/scala/runtime/stdLibPatches/Predef.scala

@@ -61,5 +61,5 @@ object Predef:
     inline def ne(inline y: AnyRef | Null): Boolean =
       !(x eq y)
 
-  extension (opt: Option.type) def fromNullable[T](t: T|Null): Option[T] = Option(t).asInstanceOf
+  extension (inline opt: Option.type) inline def fromNullable[T](t: T|Null): Option[T] = Option(t).asInstanceOf
 end Predef