Fix #4066 ./bin/dotr -language:Scala2 fails

Author: newca12

dist/bin/dotc

@@ -95,8 +95,8 @@ case "$1" in
           # break out -D and -J options and add them to JAVA_OPTS as well
           # so they reach the JVM in time to do some good. The -D options
           # will be available as system properties.
-          -D*) addJava "$1" && addScala "$1" && shift ;;
-          -J*) addJava "${1:2}" && addScala "$1" && shift ;;
+          -D*) addJava "$1" && shift ;;
+          -J*) addJava "${1:2}" && shift ;;
             *) addResidual "$1" && shift ;;
   esac
 done

dist/bin/dotr

@@ -31,6 +31,10 @@ addJvmOptions () {
   jvm_options+=("$1")
 }
 
+addRawJvmOptions () {
+  java_options+=("$1")
+}
+
 source "$PROG_HOME/bin/common"
 
 declare -a residual_args
@@ -40,6 +44,11 @@ with_compiler=false
 class_path_count=0
 CLASS_PATH=""
 
+# Little hack to check if all arguments are options
+all_params="$*"
+truncated_params="${*#-}"
+not_only_options=$(( ${#all_params} - ${#truncated_params} - $# ))
+
 while [[ $# -gt 0 ]]; do
   case "$1" in
     -repl)
@@ -65,7 +74,8 @@ while [[ $# -gt 0 ]]; do
       shift
       ;;
     -J*)
-      addJvmOptions "-${1:2}"
+      addJvmOptions "${1:2}"
+      addRawJvmOptions "${1}"
       shift ;;
     *)
       residual_args+=("$1")
@@ -74,13 +84,12 @@ while [[ $# -gt 0 ]]; do
 
   esac
 done
-
-if [ $execute_repl == true ] || ([ $execute_run == false ] && [ ${#residual_args[@]} -eq 0 ]); then
+if [ $execute_repl == true ] || ([ $execute_run == false ] && [ $not_only_options == 0 ]); then
   if [ "$CLASS_PATH" ]; then
     cp_arg="-classpath \"$CLASS_PATH\""
   fi
   echo "Starting dotty REPL..."
-  eval "\"$PROG_HOME/bin/dotc\" $cp_arg -repl ${residual_args[@]}"
+  eval "\"$PROG_HOME/bin/dotc\" $cp_arg ${java_options[@]} -repl ${residual_args[@]}"
 elif [ $execute_repl == true ] || [ ${#residual_args[@]} -ne 0 ]; then
   cp_arg="$DOTTY_LIB$PSEP$SCALA_LIB"
   if [ -z "$CLASS_PATH" ]; then