Analyze Data Flow: Initial implementation

#KT-11994 In Progress

idea/testData/slicer/outflow/functionCalls.kt

@@ -0,0 +1,9 @@
+// FLOW: OUT
+
+fun <caret>foo(n: Int) {
+
+}
+
+fun test(m: Int) {
+    val x = foo(1)
+}