Keep built-in metadata for reflection interfaces

Reflection interfaces (interfaces in kotlin.reflect.* in core/builtins/) are
now fully considered as built-ins and can be accessed via KotlinBuiltIns. This
increases runtime size by ~20kb, but only because KotlinBuiltIns is static and
is therefore constructed only via resource loading from the compiler classpath
at the moment. As soon as it's possible to inject KotlinBuiltIns to the
particular resolution process, the metadata on JVM will be loaded via standard
annotation mechanism (kotlin.jvm.internal.KotlinClass/KotlinPackage) and wasted
runtime space will be reclaimed

compiler/testData/diagnostics/tests/deprecated/functionUsage.txt

@@ -4,8 +4,8 @@ kotlin.deprecated(value = "message": kotlin.String) internal fun Obsolete(/*0*/
 internal fun block(): kotlin.Unit
 internal fun expression(): UsefulClass
 internal fun invoker(): kotlin.Unit
-internal fun reflection(): [ERROR : Error function type]
-internal fun reflection2(): [ERROR : Error function type]
+internal fun reflection(): kotlin.reflect.KFunction1<kotlin.Int, UsefulClass>
+internal fun reflection2(): kotlin.reflect.KMemberFunction0<UsefulClass, kotlin.Unit>
 kotlin.deprecated(value = "does nothing good": kotlin.String) internal fun kotlin.Any.doNothing(): kotlin.String
 
 internal final class Delegation {