KT-12852 Support breadcrumbs for Kotlin

#KT-12852 Fixed

idea/testData/codeInsight/breadcrumbs/If.kt

@@ -0,0 +1,34 @@
+fun foo() {
+    if (x) {
+        if (x.y) {
+            if (y) {
+
+            }
+            else {
+                if (a) {
+
+                }
+                else if (b) {
+
+                }
+                else if (c) {
+                    if (q) {
+
+                    }
+                    else if (qq) {
+
+                    }
+                    else if (qqq) {
+
+                    }
+                    else {
+                        if (p) <caret>return
+                    }
+                }
+                else {
+
+                }
+            }
+        }
+    }
+}