diff -r 1f41a5758cf7 -r 969c96b980b7 src/share/classes/com/sun/tools/javac/comp/Lower.java
--- a/src/share/classes/com/sun/tools/javac/comp/Lower.java	Fri Nov 23 15:13:45 2012 +0000
+++ b/src/share/classes/com/sun/tools/javac/comp/Lower.java	Thu Nov 29 09:41:48 2012 +0000
@@ -138,6 +138,10 @@
      */
     Map<ClassSymbol, JCClassDecl> classdefs;
 
+    /** A hash table mapping local classes to a list of pruned trees.
+     */
+    public Map<ClassSymbol, List<JCTree>> prunedTree = new WeakHashMap<ClassSymbol, List<JCTree>>();
+
     /** A hash table mapping virtual accessed symbols in outer subclasses
      *  to the actually referred symbol in superclasses.
      */
@@ -1039,6 +1043,12 @@
         }
     }
 
+    private void addPrunedInfo(JCTree tree) {
+        List<JCTree> infoList = prunedTree.get(currentClass);
+        infoList = (infoList == null) ? List.of(tree) : infoList.prepend(tree);
+        prunedTree.put(currentClass, infoList);
+    }
+
     /** Ensure that identifier is accessible, return tree accessing the identifier.
      *  @param sym      The accessed symbol.
      *  @param tree     The tree referring to the symbol.
@@ -1111,7 +1121,10 @@
                     // Constants are replaced by their constant value.
                     if (sym.kind == VAR) {
                         Object cv = ((VarSymbol)sym).getConstValue();
-                        if (cv != null) return makeLit(sym.type, cv);
+                        if (cv != null) {
+                            addPrunedInfo(tree);
+                            return makeLit(sym.type, cv);
+                        }
                     }
 
                     // Private variables and methods are replaced by calls
@@ -2746,12 +2759,15 @@
 
     /** Visitor method for conditional expressions.
      */
+    @Override
     public void visitConditional(JCConditional tree) {
         JCTree cond = tree.cond = translate(tree.cond, syms.booleanType);
         if (cond.type.isTrue()) {
             result = convert(translate(tree.truepart, tree.type), tree.type);
+            addPrunedInfo(cond);
         } else if (cond.type.isFalse()) {
             result = convert(translate(tree.falsepart, tree.type), tree.type);
+            addPrunedInfo(cond);
         } else {
             // Condition is not a compile-time constant.
             tree.truepart = translate(tree.truepart, tree.type);
@@ -2760,14 +2776,14 @@
         }
     }
 //where
-        private JCTree convert(JCTree tree, Type pt) {
-            if (tree.type == pt || tree.type.hasTag(BOT))
-                return tree;
-            JCTree result = make_at(tree.pos()).TypeCast(make.Type(pt), (JCExpression)tree);
-            result.type = (tree.type.constValue() != null) ? cfolder.coerce(tree.type, pt)
-                                                           : pt;
-            return result;
-        }
+    private JCTree convert(JCTree tree, Type pt) {
+        if (tree.type == pt || tree.type.hasTag(BOT))
+            return tree;
+        JCTree result = make_at(tree.pos()).TypeCast(make.Type(pt), (JCExpression)tree);
+        result.type = (tree.type.constValue() != null) ? cfolder.coerce(tree.type, pt)
+                                                       : pt;
+        return result;
+    }
 
     /** Visitor method for if statements.
      */
@@ -2775,12 +2791,14 @@
         JCTree cond = tree.cond = translate(tree.cond, syms.booleanType);
         if (cond.type.isTrue()) {
             result = translate(tree.thenpart);
+            addPrunedInfo(cond);
         } else if (cond.type.isFalse()) {
             if (tree.elsepart != null) {
                 result = translate(tree.elsepart);
             } else {
                 result = make.Skip();
             }
+            addPrunedInfo(cond);
         } else {
             // Condition is not a compile-time constant.
             tree.thenpart = translate(tree.thenpart);