Properly handle vararg interpretation for classic frontend

#KT-55108 Fixed

compiler/testData/codegen/box/annotations/kt55108.kt

@@ -0,0 +1,28 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_REFLECT
+
+annotation class A(vararg val strings: String)
+
+@A(*arrayOf("foo", "bar"), "baz")
+class B
+
+@A("baz", *arrayOf("foo", "bar"), "xyz")
+class C
+
+@A(*arrayOf("foo", "bar", "xyz"))
+class D
+
+@A("foo", "baz", "bar")
+class E
+
+@A(*arrayOf("foo", "bar"), *arrayOf("baz", "xyz"))
+class F
+
+fun box(): String {
+    assert((B::class.annotations.single() as A).strings.contentEquals(arrayOf("foo", "bar", "baz"))) { "Fail1" }
+    assert((C::class.annotations.single() as A).strings.contentEquals(arrayOf("baz", "foo", "bar", "xyz"))) { "Fail 2" }
+    assert((D::class.annotations.single() as A).strings.contentEquals(arrayOf("foo", "bar", "xyz"))) { "Fail 3" }
+    assert((E::class.annotations.single() as A).strings.contentEquals(arrayOf("foo", "baz", "bar"))) { "Fail 4" }
+    assert((F::class.annotations.single() as A).strings.contentEquals(arrayOf("foo", "bar", "baz", "xyz"))) { "Fail 5" }
+    return "OK"
+}