Calculate default mask shift properly

#KT-18689 Fixed

compiler/testData/codegen/boxInline/callableReference/bound/mixed.kt

@@ -0,0 +1,23 @@
+// FILE: 1.kt
+
+package test
+
+class Foo {
+    fun foo() = "OK"
+    fun foo2() = "OK2"
+}
+
+inline fun inlineFn(a: String, crossinline fn: () -> String, x: Long = 1, crossinline fn2: () -> String, c: String): String {
+    return a + fn() + x + fn2() + c
+}
+
+// FILE: 2.kt
+
+import test.*
+
+private val foo = Foo()
+
+fun box(): String {
+    val result = inlineFn("a", foo::foo, 5, foo::foo2, "end")
+    return if (result == "aOK5OK2end") "OK" else "fail: $result"
+}