JVM_IR: add a test for when(enum) binary compatibility

compiler/testData/compileKotlinAgainstCustomBinaries/changedEnumsInLibrary/source.kt

@@ -0,0 +1,18 @@
+import test.*
+
+fun f1(x: E1) = when (x) {
+    E1.A -> "A"
+    E1.B -> "B"
+    E1.C -> "C"
+}
+
+fun f2(x: E2) = when (x) {
+    E2.A -> "A"
+    E2.B -> "B"
+    E2.C -> "C"
+}
+
+fun run(): String {
+    val c2 = try { f2(E2.C) } catch (e: java.lang.NoSuchFieldError) { "" }
+    return f1(E1.A) + f1(E1.B) + f1(E1.C) + f2(E2.A) + f2(E2.B) + c2
+}