Find Usages: Support of secondary constructors and delegation calls

idea/testData/findUsages/java/findConstructorUsages/javaDefaultConstructorInDelegationCall.0.java

@@ -0,0 +1,7 @@
+// PSI_ELEMENT: com.intellij.psi.PsiMethod
+// OPTIONS: usages
+public class J {
+    public <caret>J() {
+
+    }
+}