Revert "Declare more TypeClass instances as builtin."

This reverts commit f7f62a609d.

gen/typinf.cpp

@@ -267,7 +267,13 @@ int TypeClass::builtinTypeInfo()
     /* This is statically put out with the ClassInfo, so
      * claim it is built in so it isn't regenerated by each module.
      */
+#if IN_DMD
     return mod ? 0 : 1;
+#elif IN_LLVM
+    // FIXME if I enable this, the way LDC does typeinfo will cause a bunch
+    // of linker errors to missing class typeinfo definitions.
+    return 0;
+#endif
 }
 
 /* ========================================================================= */