Inline function: add extra tests taken from intellij-community

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

@@ -0,0 +1,17 @@
+class Foo {
+    fun getComponent(i: Int?): String? {
+        return null
+    }
+
+    var myI: Int? = null
+
+    fun usage() {
+        if (myI != null)
+            method(myI)
+    }
+
+    fun <caret>method(i: Int?) {
+        println(getComponent(myI)!! + getComponent(i)!!)
+    }
+
+}