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vp8 rc: Clear system state at the end of calls

Clear system state at the end of rc calls to make sure the state is
consistent before and after

Change-Id: I59fe9c99485b1a8603c20db37961339b7575455f

--- a/vp8/vp8_ratectrl_rtc.cc

+++ b/vp8/vp8_ratectrl_rtc.cc

@@ -168,6 +168,7 @@

   }

   vp8_new_framerate(cpi_, cpi_->framerate);

+  vpx_clear_system_state();

 }

 void VP8RateControlRTC::ComputeQP(const VP8FrameParamsQpRTC &frame_params) {

@@ -251,6 +252,7 @@

   q_ = vp8_regulate_q(cpi_, cpi_->this_frame_target);

   vp8_set_quantizer(cpi_, q_);

+  vpx_clear_system_state();

 }

 int VP8RateControlRTC::GetQP() const { return q_; }

@@ -340,5 +342,6 @@

   cpi_->frames_since_key++;

   if (cpi_->oxcf.number_of_layers > 1) vp8_save_layer_context(cpi_);

+  vpx_clear_system_state();

 }

 }  // namespace libvpx