decompiler: fixed line mapping in synchronized block

testData/results/TestSynchronizedMapping.dec

@@ -0,0 +1,30 @@
+package pkg;
+
+public class TestSynchronizedMapping {
+   public int test(int var1) {
+      synchronized(this) {
+         return var1++;
+      }
+   }
+
+   public void test2(String var1) {
+      System.out.println(var1);
+   }
+}
+
+class 'pkg/TestSynchronizedMapping' {
+   method 'test (I)I' {
+      3      4
+      5      5
+   }
+
+   method 'test2 (Ljava/lang/String;)V' {
+      0      10
+      4      10
+   }
+}
+
+Lines mapping:
+8 <-> 5
+9 <-> 6
+14 <-> 11

testData/src/pkg/TestSynchronizedMapping.java

@@ -0,0 +1,16 @@
+package pkg;
+
+import java.lang.Override;
+import java.lang.Runnable;
+
+public class TestSynchronizedMapping {
+  public int test(int a) {
+    synchronized (this) {
+      return a++;
+    }
+  }
+
+  public void test2(String a) {
+    System.out.println(a);
+  }
+}