decompiler: major line numbers fixes

testData/results/TestExtendsList.dec

@@ -2,10 +2,26 @@ package pkg;
 
 public class TestExtendsList {
    static <T extends Comparable<? super T>> T m1(T var0) {
-      return null;
+      return null;// 20
    }
 
    static <T extends Object & Comparable<? super T>> T m2(T var0) {
-      return null;
+      return null;// 24
    }
 }
+
+class 'pkg/TestExtendsList' {
+   method 'm1 (Ljava/lang/Comparable;)Ljava/lang/Comparable;' {
+      0      4
+      1      4
+   }
+
+   method 'm2 (Ljava/lang/Object;)Ljava/lang/Object;' {
+      0      8
+      1      8
+   }
+}
+
+Lines mapping:
+20 <-> 5
+24 <-> 9