IR: do not infer array element types for non-annotation constants

While annotations restrict the set of allowed types to a few final
built-ins, in arbitrary constants we can have array elements that are
some subtype of the array's element type.

 #KT-48671 Fixed

compiler/testData/codegen/box/arrays/constantArrayOfAny.kt

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+val x: Any = arrayOf<Any>(arrayOf("OK"))
+
+fun box(): String = ((x as Array<Any>)[0] as Array<String>)[0]