Tests: references to private/internal primary val of inline class

compiler/testData/codegen/box/inlineClasses/callableReferences/inlineClassInternalPrimaryVal.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+// WITH_RUNTIME
+import kotlin.test.assertEquals
+
+inline class Z(internal val x: Int)
+inline class L(internal val x: Long)
+inline class S(internal val x: String)
+
+fun box(): String {
+    assertEquals(42, Z::x.get(Z(42)))
+    assertEquals(1234L, L::x.get(L(1234L)))
+    assertEquals("abc", S::x.get(S("abc")))
+
+    assertEquals(42, Z::x.invoke(Z(42)))
+    assertEquals(1234L, L::x.invoke(L(1234L)))
+    assertEquals("abc", S::x.invoke(S("abc")))
+
+    return "OK"
+}