JVM IR: Mark annotation implementation classes as anonymous

And add tests to ensure that annotation implementation classes are
handled correctly in jvm-abi-gen.

plugins/jvm-abi-gen/testData/compile/inlineAnnotationInstantiation/app/app.kt

@@ -0,0 +1,7 @@
+package app
+
+import lib.*
+
+fun runAppAndReturnOk(): String {
+    return a().value
+}

plugins/jvm-abi-gen/testData/compile/inlineAnnotationInstantiation/directives.txt

@@ -0,0 +1,3 @@
+// LANGUAGE_VERSION: 1.6
+// IGNORE_BACKEND_LEGACY: JVM
+// IGNORE_BACKEND: JVM

plugins/jvm-abi-gen/testData/compile/inlineAnnotationInstantiation/lib/lib.kt

@@ -0,0 +1,5 @@
+package lib
+
+annotation class A(val value: String)
+
+inline fun a() = A("OK")