SI-8578 Avoid another potential fresh name clash

No test case for this one, but see the preceding commit for
the class of bug that I'm trying to avoid.

Author: retronym

src/compiler/scala/tools/nsc/transform/Delambdafy.scala

@@ -132,7 +132,7 @@ abstract class Delambdafy extends Transform with TypingTransformers with ast.Tre
         }
         val params = ((optionSymbol(thisProxy) map {proxy:Symbol => ValDef(proxy)}) ++ (target.paramss.flatten map ValDef.apply)).toList
 
-        val methSym = oldClass.newMethod(unit.freshTermName(nme.accessor.toString()), target.pos, FINAL | BRIDGE | SYNTHETIC | PROTECTED | STATIC)
+        val methSym = oldClass.newMethod(unit.freshTermName(nme.accessor.toString() + "$"), target.pos, FINAL | BRIDGE | SYNTHETIC | PROTECTED | STATIC)
 
         val paramSyms = params map {param => methSym.newSyntheticValueParam(param.symbol.tpe, param.name) }