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

core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java

@@ -38,6 +38,7 @@ import org.jetbrains.kotlin.types.checker.JetTypeChecker;
 import java.io.InputStream;
 import java.util.*;
 
+import static kotlin.KotlinPackage.setOf;
 import static kotlin.KotlinPackage.single;
 import static org.jetbrains.kotlin.builtins.PrimitiveType.*;
 import static org.jetbrains.kotlin.resolve.DescriptorUtils.getFqName;
@@ -113,7 +114,8 @@ public class KotlinBuiltIns {
         );
 
         PackageFragmentProvider packageFragmentProvider = BuiltinsPackage.createBuiltInPackageFragmentProvider(
-                storageManager, builtInsModule, Collections.singleton(BUILT_INS_PACKAGE_FQ_NAME),
+                storageManager, builtInsModule,
+                setOf(BUILT_INS_PACKAGE_FQ_NAME, BuiltinsPackage.getKOTLIN_REFLECT_FQ_NAME()),
                 FlexibleTypeCapabilitiesDeserializer.ThrowException.INSTANCE$, new Function1<String, InputStream>() {
                     @Override
                     public InputStream invoke(String path) {

core/descriptors/src/org/jetbrains/kotlin/builtins/ReflectionTypes.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.builtins
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
@@ -29,7 +28,7 @@ import org.jetbrains.kotlin.types.*
 import java.util.ArrayList
 import kotlin.properties.Delegates
 
-private val KOTLIN_REFLECT_FQ_NAME = FqName("kotlin.reflect")
+val KOTLIN_REFLECT_FQ_NAME = FqName("kotlin.reflect")
 
 public class ReflectionTypes(private val module: ModuleDescriptor) {
     private val kotlinReflectScope: JetScope? by Delegates.lazy {