8261444: Remove unused fields in Lower

Reviewed-by: vromero

Author: cl4es

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Lower.java

@@ -92,11 +92,8 @@ public static Lower instance(Context context) {
     private DiagnosticPosition make_pos;
     private final ConstFold cfolder;
     private final Target target;
-    private final Source source;
     private final TypeEnvs typeEnvs;
     private final Name dollarAssertionsDisabled;
-    private final Name classDollar;
-    private final Name dollarCloseResource;
     private final Types types;
     private final boolean debugLower;
     private final boolean disableProtectedAccessors; // experimental
@@ -114,14 +111,9 @@ protected Lower(Context context) {
         make = TreeMaker.instance(context);
         cfolder = ConstFold.instance(context);
         target = Target.instance(context);
-        source = Source.instance(context);
         typeEnvs = TypeEnvs.instance(context);
         dollarAssertionsDisabled = names.
             fromString(target.syntheticNameChar() + "assertionsDisabled");
-        classDollar = names.
-            fromString("class" + target.syntheticNameChar());
-        dollarCloseResource = names.
-            fromString(target.syntheticNameChar() + "closeResource");
 
         types = Types.instance(context);
         Options options = Options.instance(context);