Minor. Add more tests

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

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class A<T: String>(val a: T)
+
+fun <T: String> isEqualNA(x: A<T>?, y: A<T>) = x == y
+fun <T: String> isEqualAN(x: A<T>, y: A<T>?) = x == y
+
+fun box(): String {
+    if (isEqualNA(null, A(""))) return "Fail 1"
+    if (isEqualAN(A(""), null)) return "Fail 2"
+    if (!isEqualNA(A(""), A(""))) return "Fail 3"
+    if (!isEqualAN(A(""), A(""))) return "Fail 4"
+    return "OK"
+}