message: Zero-initialise specialization constant data
diff: @@ -3471,7 +3471,7 @@ ShaderDebugTrace *VulkanReplay::DebugPixel(uint32_t eventId, uint32_t x, uint32_
  uint32_t arrayLength;
  float destX;
  float destY;
  - } specData;
  + } specData = {};
  specData.arrayLength = overdrawLevels;
  specData.destX = float(x) + 0.5f;
  