[IR] Add new test to check that nullable access to enum is not evaluated

Just a safety check. If an expression like `EnumClass.Value?.name` was
evaluated, we would consider it as breaking change.

compiler/testData/codegen/box/involvesIrInterpreter/intrinsicConst/nullableEnumName.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JVM_IR
+// TARGET_BACKEND: JS_IR
+// TARGET_BACKEND: NATIVE
+// WITH_STDLIB
+fun <T> T.id() = this
+
+enum class EnumClass {
+    OK
+}
+
+val shouldNotBeEvaluated1 = EnumClass.OK?.name ?: ""
+val shouldNotBeEvaluated2 = EnumClass.OK?.name?.toString()
+val shouldNotBeEvaluated3 = EnumClass.OK?.name.toString()
+
+fun box(): String {
+    if (shouldNotBeEvaluated1 != "OK") return "Fail 1"
+    if (shouldNotBeEvaluated2 != "OK") return "Fail 2"
+    if (shouldNotBeEvaluated3 != "OK") return "Fail 3"
+    return shouldNotBeEvaluated1.id()
+}