message: Demote error to warning when spec constants are unbound
  * This is perfectly legal, the spec constant data provided in the pipeline is
  just ignored. It's only a problem if this indicates some RenderDoc bug
  matching up the constant IDs.
diff: @@ -1266,7 +1266,7 @@ void VulkanReplay::SavePipelineState(uint32_t eventId)
  if(idx == -1)
  {
  - RDCERR("Couldn't find offset for spec ID %u", s.specID);
  + RDCWARN("Couldn't find offset for spec ID %u", s.specID);
  continue;
  }
  