Do not load error classes in ReflectionTypes

Previously ReflectionTypes.find returned an error class in case a class
is not found in the module dependencies. The problem with this approach
is that each call site should call ErrorUtils.isError on the result and
report an error if needed, in order to stop this type from reaching the
codegen, which can't handle error types.

Now we create a MockClassDescriptor instance instead. It's not an error
class, so it'll be handled correctly in the codegen. Also its scope is
empty and errors are reported on any non-trivial usage (see
MissingDependencyClassChecker), so this approach is not worse than error
classes

 #KT-16484 Fixed

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsReflectionAPICallChecker.kt

@@ -25,12 +25,18 @@ import org.jetbrains.kotlin.diagnostics.Errors.UNSUPPORTED
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.calls.checkers.AbstractReflectionApiCallChecker
 import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
+import org.jetbrains.kotlin.serialization.deserialization.NotFoundClasses
 import org.jetbrains.kotlin.storage.StorageManager
 import org.jetbrains.kotlin.storage.getValue
 
 private val ALLOWED_KCLASS_MEMBERS = setOf("simpleName", "isInstance")
 
-class JsReflectionAPICallChecker(private val module: ModuleDescriptor, storageManager: StorageManager) : AbstractReflectionApiCallChecker(module, storageManager) {
+class JsReflectionAPICallChecker(
+        module: ModuleDescriptor,
+        private val reflectionTypes: ReflectionTypes,
+        notFoundClasses: NotFoundClasses,
+        storageManager: StorageManager
+) : AbstractReflectionApiCallChecker(module, notFoundClasses, storageManager) {
     override val isWholeReflectionApiAvailable: Boolean
         get() = false
 
@@ -38,7 +44,7 @@ class JsReflectionAPICallChecker(private val module: ModuleDescriptor, storageMa
         context.trace.report(UNSUPPORTED.on(element, "This reflection API is not supported yet in JavaScript"))
     }
 
-    private val kClass by storageManager.createLazyValue { ReflectionTypes(module).kClass }
+    private val kClass by storageManager.createLazyValue { reflectionTypes.kClass }
 
     override fun isAllowedReflectionApi(descriptor: CallableDescriptor, containingClass: ClassDescriptor): Boolean =
             super.isAllowedReflectionApi(descriptor, containingClass) ||