Create empty method for annotated properties w/o fields

There was no place in bytecode where annotations on properties without backing
fields could be stored to. Now they're written on a synthetic empty void method
with a special name ("propertyName$annotations").

(Annotations on properties cannot simply be written on getters in bytecode,
since a getter can have annotations of its own.)

compiler/testData/codegen/properties/annotatedPackagePropertyNoField.kt

@@ -0,0 +1,6 @@
+import java.lang.annotation.*
+
+Retention(RetentionPolicy.RUNTIME) annotation class SomeAnnotation(val value: String)
+
+[SomeAnnotation("OK")] val property: Int
+    get() = 42