JVM_IR: don't generate repeated ElementType values in @Target

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

@@ -0,0 +1,23 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_RUNTIME
+// FULL_JDK
+
+@Target(
+    AnnotationTarget.FUNCTION, AnnotationTarget.FIELD,
+    AnnotationTarget.PROPERTY, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER
+)
+public annotation class TestAnn
+
+fun box(): String {
+    val testAnnClass = TestAnn::class.java
+    val targetAnn = testAnnClass.getAnnotation(java.lang.annotation.Target::class.java)
+    val targets = targetAnn.value
+    if (targets.size != 2) {
+        return targets.toList().toString()
+    }
+    if (targets.toSet() != setOf(java.lang.annotation.ElementType.FIELD, java.lang.annotation.ElementType.METHOD)) {
+        return targets.toList().toString()
+    }
+    return "OK"
+}