Fix boxing/unboxing for generic functions on index expressions

Unsubstituted type should be used for coercion to box value of
 inline class type if it's needed. For the substituted value it's not
 known if it was a generic parameter or not.

 #KT-27502 Fixed

compiler/testData/codegen/box/inlineClasses/unboxValueOfAnyBeforeMethodInvocation.kt

@@ -0,0 +1,22 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: JVM_IR
+
+inline class NullableInt(private val holder: Any?) {
+    val intValue: Int get() = holder as Int
+}
+
+val prop: ArrayList<NullableInt> = arrayListOf(NullableInt(0))
+
+fun box(): String {
+    val a = prop[0].intValue
+    if (a != 0) return "Error 1: $a"
+
+    val local = mutableListOf(NullableInt(1))
+    val b = local[0].intValue
+    if (b != 1) return "Error 2: $b"
+
+    prop[0] = NullableInt(2)
+    if (prop[0].intValue != 2) return "Error 3: ${prop[0].intValue}"
+
+    return "OK"
+}