SI-7747 Limit previous change to imports of REPL vals

We only need to introduce the temporary val in the imports
wrapper when we are importing a val or module defined in the REPL.

The test case from the previous commit still passes, but
we are generating slightly simpler code.

Compared to 2.11.6, these two commits result in the following
diff:

  https://gist.github.com/retronym/aa4bd3aeef1ab1b85fe9

Author: retronym

src/repl/scala/tools/nsc/interpreter/Imports.scala

@@ -165,12 +165,17 @@ trait Imports {
           case x if isClassBased =>
             for (imv <- x.definedNames) {
               if (!currentImps.contains(imv)) {
-                val valName = req.lineRep.packageName + req.lineRep.readName
-                if (!tempValLines.contains(req.lineRep.lineId)) {
-                  code.append(s"val $valName = $objName\n")
-                  tempValLines += req.lineRep.lineId
+                x match {
+                  case _: ValHandler | _: ModuleHandler =>
+                    val valName = req.lineRep.packageName + req.lineRep.readName
+                    if (!tempValLines.contains(req.lineRep.lineId)) {
+                      code.append(s"val $valName = $objName\n")
+                      tempValLines += req.lineRep.lineId
+                    }
+                    code.append(s"import $valName ${req.accessPath}.`$imv`;\n")
+                  case _ =>
+                    code.append("import " + objName + req.accessPath + ".`" + imv + "`\n")
                 }
-                code.append(s"import $valName ${req.accessPath}.`$imv`;\n")
                 currentImps += imv
               }
             }

test/files/run/t7747-repl.check

@@ -258,15 +258,12 @@ class $read extends Serializable {
       super.<init>;
       ()
     };
-    val $line44$read = $line44.$read.INSTANCE;
-    import $line44$read.$iw.$iw.BippyBups;
-    import $line44$read.$iw.$iw.BippyBups;
-    val $line45$read = $line45.$read.INSTANCE;
-    import $line45$read.$iw.$iw.PuppyPups;
-    import $line45$read.$iw.$iw.PuppyPups;
-    val $line46$read = $line46.$read.INSTANCE;
-    import $line46$read.$iw.$iw.Bingo;
-    import $line46$read.$iw.$iw.Bingo;
+    import $line44.$read.INSTANCE.$iw.$iw.BippyBups;
+    import $line44.$read.INSTANCE.$iw.$iw.BippyBups;
+    import $line45.$read.INSTANCE.$iw.$iw.PuppyPups;
+    import $line45.$read.INSTANCE.$iw.$iw.PuppyPups;
+    import $line46.$read.INSTANCE.$iw.$iw.Bingo;
+    import $line46.$read.INSTANCE.$iw.$iw.Bingo;
     class $iw extends Serializable {
       def <init>() = {
         super.<init>;