JVM IR: fix ::class reference and type mapping for scripts

#KT-46284 Fixed

compiler/testData/codegen/box/script/classReference.kt

@@ -0,0 +1,10 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// IGNORE_LIGHT_ANALYSIS
+// WITH_RUNTIME
+// FILE: test.kt
+
+fun box(): String =
+    OK::class.java.simpleName
+
+// FILE: OK.kts