Support enums as annotation arguments in deserialized Kotlin descriptors

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

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+package test
+
+import java.lang.annotation.ElementType
+
+annotation class Anno(t: ElementType)
+
+Anno(ElementType.METHOD) fun foo() {}
+
+Anno(ElementType.FIELD) val bar = 42

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

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+package test
+
+test.Anno(t = ElementType.FIELD: java.lang.annotation.ElementType) internal val bar: jet.Int
+    internal fun <get-bar>(): jet.Int
+test.Anno(t = ElementType.METHOD: java.lang.annotation.ElementType) internal fun foo(): jet.Unit
+
+internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno(/*0*/ t: java.lang.annotation.ElementType)
+}