decompiler: fixed line mapping in synchronized block

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);
+  }
+}