Prohibit creation of JetLightClass on built-ins

If we allow JetLightClass to be created on built-in types, a normal codegen
would be launched, with a mapping from Kotlin to Java types enabled, every time
IDE requests built-in classes. Codegen would then try to make something
meaningless, e.g. create a class for a primitive type (since our jet.Boolean is
mapped to primitive boolean). This would result in different exceptions when
navigating to built-in library from IDE.

Add a helpful error message to ClassFileFactory if we ever again produce
classes for primitive types.

compiler/frontend/src/org/jetbrains/jet/lang/types/lang/JetStandardClasses.java

@@ -542,4 +542,13 @@ public class JetStandardClasses {
     public static Collection<DeclarationDescriptor> getAllStandardClasses() {
         return STANDARD_CLASSES.getAllDescriptors();
     }
+
+    public static boolean isStandardClass(@NotNull FqName fqName) {
+        for (DeclarationDescriptor descriptor : getAllStandardClasses()) {
+            if (DescriptorUtils.getFQName(descriptor).equals(fqName.toUnsafe())) {
+                return true;
+            }
+        }
+        return false;
+    }
 }