Inline callable references

#KT-6900 Fixed

compiler/testData/codegen/boxInline/callableReference/topLevelExtension.1.kt

@@ -0,0 +1,9 @@
+import test.*
+
+fun box() : String {
+    return if (call(10, Int::calc) == 100) "OK" else "fail"
+}
+
+fun Int.calc(p: Int) : Int {
+    return p * this
+}