IR to CFG test generator, sequential function tests

compiler/testData/ir/irCfg/expressionFun.txt

@@ -0,0 +1,14 @@
+// FILE: /expressionFun.kt
+// FUN: foo
+BB 0
+CONTENT
+      1 FUN public fun foo(arg: kotlin.Int): kotlin.Int
+      2 GET_VAR 'value-parameter arg: Int' type=kotlin.Int origin=null
+      3 RETURN type=kotlin.Nothing from='foo(Int): Int'
+OUTGOING -> NONE
+    Function exit: FUN public fun foo(arg: kotlin.Int): kotlin.Int
+
+// END FUN: foo
+
+// END FILE: /expressionFun.kt
+