Inline function: add extra tests taken from intellij-community

idea/testData/refactoring/inline/function/fromIntellij/CallUnderIf.kt.after

@@ -0,0 +1,14 @@
+class Foo {
+    fun getComponent(i: Int?): String? {
+        return null
+    }
+
+    var myI: Int? = null
+
+    fun usage() {
+        if (myI != null) {
+            println(getComponent(myI)!! + getComponent(myI)!!)
+        }
+    }
+
+}