Mixin kotlin.Number methods into j.l.Number member scope

#KT-9672 Fixed

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/MemberIndex.kt

@@ -42,7 +42,11 @@ object EMPTY_MEMBER_INDEX : MemberIndex {
 private val ADDITIONAL_MEMBER_NAMES_MAP = mapOf(
         FqName("java.util.List") to listOf(Name.identifier("removeAt")),
         FqName("java.lang.CharSequence") to listOf(Name.identifier("get")),
-        FqName("java.util.Map") to listOf(Name.identifier("keys"), Name.identifier("entries"))
+        FqName("java.util.Map") to listOf(Name.identifier("keys"), Name.identifier("entries")),
+        FqName("java.lang.Number") to listOf(
+                Name.identifier("toByte"), Name.identifier("toShort"), Name.identifier("toInt"), Name.identifier("toLong"),
+                Name.identifier("toFloat"), Name.identifier("toDouble")
+        )
 )
 
 open class ClassMemberIndex(val jClass: JavaClass, val memberFilter: (JavaMember) -> Boolean) : MemberIndex {