Support enums as annotation arguments in deserialized Kotlin descriptors

compiler/testData/loadKotlin/annotations/classes/EnumArgument.kt

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+package test
+
+import java.lang.annotation.ElementType
+
+annotation class Anno(t: ElementType)
+
+Anno(ElementType.METHOD) class Class {
+    Anno(ElementType.PARAMETER) inner class Inner
+    
+    Anno(ElementType.TYPE) class Nested
+
+    Anno(ElementType.ANNOTATION_TYPE) class object
+}

compiler/testData/loadKotlin/annotations/classes/EnumArgument.txt

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+package test
+
+internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno(/*0*/ t: java.lang.annotation.ElementType)
+}
+
+test.Anno(t = ElementType.METHOD: java.lang.annotation.ElementType) internal final class Class {
+    /*primary*/ public constructor Class()
+    
+    test.Anno(t = ElementType.ANNOTATION_TYPE: java.lang.annotation.ElementType) internal class object <class-object-for-Class> {
+        /*primary*/ private constructor <class-object-for-Class>()
+    }
+    
+    test.Anno(t = ElementType.PARAMETER: java.lang.annotation.ElementType) internal final inner class Inner {
+        /*primary*/ public constructor Inner()
+    }
+    
+    test.Anno(t = ElementType.TYPE: java.lang.annotation.ElementType) internal final class Nested {
+        /*primary*/ public constructor Nested()
+    }
+}

compiler/testData/loadKotlin/annotations/classes/Retention.kt

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+package test
+
+import java.lang.annotation.*
+
+Retention(RetentionPolicy.RUNTIME) annotation class Anno

compiler/testData/loadKotlin/annotations/classes/Retention.txt

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+package test
+
+java.lang.annotation.Retention(value = RetentionPolicy.RUNTIME: java.lang.annotation.RetentionPolicy) internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno()
+}