Remove ErasedFunction

This can be removed now that the reference compiler no longer tries to
load the symbol of `ErasedFunction`.

Author: nicolasstucki

library/src/scala/runtime/ErasedFunction.scala

@@ -85,7 +85,6 @@ val experimentalDefinitionInLibrary = Set(
 
   // New feature: functions with erased parameters.
   // Need erasedDefinitions enabled.
-  "scala.runtime.ErasedFunction", // will be removed (now using PolyFunction)
   "scala.quoted.Quotes.reflectModule.MethodTypeMethods.erasedParams",
   "scala.quoted.Quotes.reflectModule.MethodTypeMethods.hasErasedParams",
   "scala.quoted.Quotes.reflectModule.TermParamClauseMethods.erasedArgs",