KJS: allow to use KClass::isInstance; implement isInstance in KClassImpl

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/checkers/AbstractReflectionApiCallChecker.kt

@@ -29,6 +29,8 @@ import org.jetbrains.kotlin.storage.StorageManager
 import org.jetbrains.kotlin.storage.getValue
 import org.jetbrains.kotlin.util.OperatorNameConventions
 
+private val ANY_MEMBER_NAMES = setOf("equals", "hashCode", "toString")
+
 /**
  * Checks that there are no usages of reflection API which will fail at runtime.
  */
@@ -41,8 +43,6 @@ abstract class AbstractReflectionApiCallChecker(private val module: ModuleDescri
         setOf(reflectionTypes.kProperty0, reflectionTypes.kProperty1, reflectionTypes.kProperty2)
     }
 
-    private val ANY_MEMBER_NAMES = setOf("equals", "hashCode", "toString")
-
     final override fun check(resolvedCall: ResolvedCall<*>, reportOn: PsiElement, context: CallCheckerContext) {
         if (isWholeReflectionApiAvailable) return