Add inline override regression test

Author: nicolasstucki

tests/run/inline-override-num.scala

@@ -0,0 +1,24 @@
+trait Num[T] {
+  def plus(x: T, y: T): T
+}
+
+object Num {
+  class IntNum extends Num[Int] {
+    inline def plus(inline x: Int, inline y: Int): Int = x + y
+  }
+  given IntNum
+
+  extension Extension on [T](inline x: T)(using inline num: Num[T]) {
+    inline def +(inline y: T): T = num.plus(x, y)
+  }
+}
+
+import Num.Extension._
+
+inline def twiceInlined[T: Num](x : T): T = x + x
+def twice[T: Num](x : T): T = x + x
+
+@main def Test =
+  val x: Int = 3
+  assert(6 == twiceInlined(x)) // code will be x + x using the primitive Int.+
+  assert(6 == twice(x)) // will call IntNum.plus through virtual dispatch