changeOwner of rhs of slef-valdef (should fix scala#11251)

Author: rssh

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -501,7 +501,7 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(using Context) {
           ref(rhsClsSym.sourceModule)
         else
           inlineCallPrefix
-      val binding = ValDef(selfSym.asTerm, rhs).withSpan(selfSym.span).setDefTree
+      val binding = ValDef(selfSym.asTerm, rhs.changeOwner(ctx.owner,selfSym)).withSpan(selfSym.span).setDefTree
       bindingsBuf += binding
       inlining.println(i"proxy at $level: $selfSym = ${bindingsBuf.last}")
       lastSelf = selfSym