Support reflection calls to multifile class members

#KT-11447 Fixed

compiler/testData/codegen/box/reflection/multifileClasses/javaFieldForVarAndConstVal.kt

@@ -0,0 +1,52 @@
+// WITH_REFLECT
+// FULL_JDK
+// FILE: 1.kt
+
+@file:kotlin.jvm.JvmName("Test")
+@file:kotlin.jvm.JvmMultifileClass
+package test
+
+import kotlin.reflect.jvm.*
+import kotlin.test.assertEquals
+
+fun testX() {
+    val field = ::x.javaField ?: throw AssertionError("No java field for ${::x.name}")
+
+    try {
+        field.get(null)
+        throw AssertionError("Fail: field.get should fail because the field is private")
+    }
+    catch (e: IllegalAccessException) {
+        // OK
+    }
+
+    field.setAccessible(true)
+    assertEquals("I am x", field.get(null))
+    field.set(null, "OK")
+}
+
+fun testY() {
+    val field = ::y.javaField ?: throw AssertionError("No java field for ${::y.name}")
+
+    assertEquals("I am const y", field.get(null))
+
+    // Accessible = false should have no effect because the field is public
+    field.setAccessible(false)
+
+    assertEquals("I am const y", field.get(null))
+}
+
+fun box(): String {
+    testX()
+    testY()
+    return x
+}
+
+// FILE: 2.kt
+
+@file:kotlin.jvm.JvmName("Test")
+@file:kotlin.jvm.JvmMultifileClass
+package test
+
+var x = "I am x"
+const val y = "I am const y"