Remove unused setting -Xrepl-line-width.

Author: sjrd

compiler/src/dotty/tools/dotc/config/ScalaSettings.scala

@@ -118,7 +118,6 @@ class ScalaSettings extends Settings.SettingGroup with CommonScalaSettings {
   val XprintSuspension: Setting[Boolean] = BooleanSetting("-Xprint-suspension", "Show when code is suspended until macros are compiled.")
   val Xprompt: Setting[Boolean] = BooleanSetting("-Xprompt", "Display a prompt after each error (debugging option).")
   val XshowPhases: Setting[Boolean] = BooleanSetting("-Xshow-phases", "Print all compiler phases.")
-  val XreplLineWidth: Setting[Int] = IntSetting("-Xrepl-line-width", "Maximal number of columns per line for REPL output.", 390)
   val XreplDisableDisplay: Setting[Boolean] = BooleanSetting("-Xrepl-disable-display", "Do not display definitions in REPL.")
   val XfatalWarnings: Setting[Boolean] = BooleanSetting("-Xfatal-warnings", "Fail the compilation if there are any warnings.")
   val XverifySignatures: Setting[Boolean] = BooleanSetting("-Xverify-signatures", "Verify generic signatures in generated bytecode.")