Added ClearSystemState in a unit test
Added ClearSystemState in a unit test

There is another unit test that has been failing randomly on win32
build. Investigation has shown that the failure was caused by simd
register state is not reset appropriately in the fdct8x8 test. This
commit added ClearSystemState() in the teardown of this test, tests
showed it resolved the random failure issue for win32 build.

Related issue: https://code.google.com/p/webm/issues/detail?id=614

Change-Id: I9381d0c1a6f4b855ccaeef1aca8c417ac8c71ee2

iniwf/webm.libvpx,jdm/libvpx,Maria1099/webm.libvpx,matanbs/vp982,felipebetancur/libvpx,mbebenita/aom,shareefalis/libvpx,reimaginemedia/webm.libvpx,thdav/aom,ittiamvpx/libvpx,jmvalin/aom,matanbs/vp982,turbulenz/libvpx,felipebetancur/libvpx,Acidburn0zzz/webm.libvpx,WebRTC-Labs/libvpx,turbulenz/libvpx,luctrudeau/aom,reimaginemedia/webm.libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,cinema6/libvpx,felipebetancur/libvpx,matanbs/vp982,jacklicn/webm.libvpx,liqianggao/libvpx,GrokImageCompression/aom,Acidburn0zzz/webm.libvpx,VTCSecureLLC/libvpx,iniwf/webm.libvpx,matanbs/webm.libvpx,turbulenz/libvpx,jmvalin/aom,jdm/libvpx,stewnorriss/libvpx,zofuthan/libvpx,gshORTON/webm.libvpx,ittiamvpx/libvpx,shareefalis/libvpx,ittiamvpx/libvpx-1,goodleixiao/vpx,abwiz0086/webm.libvpx,smarter/aom,jacklicn/webm.libvpx,running770/libvpx,liqianggao/libvpx,zofuthan/libvpx,turbulenz/libvpx,webmproject/libvpx,Distrotech/libvpx,Laknot/libvpx,lyx2014/libvpx_c,shyamalschandra/libvpx,running770/libvpx,matanbs/vp982,sanyaade-teachings/libvpx,shareefalis/libvpx,openpeer/libvpx_new,felipebetancur/libvpx,stewnorriss/libvpx,cinema6/libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,matanbs/webm.libvpx,smarter/aom,webmproject/libvpx,kleopatra999/webm.libvpx,pcwalton/libvpx,jacklicn/webm.libvpx,zofuthan/libvpx,thdav/aom,smarter/aom,goodleixiao/vpx,Maria1099/webm.libvpx,mbebenita/aom,shareefalis/libvpx,running770/libvpx,hsueceumd/test_hui,kalli123/webm.libvpx,n4t/libvpx,Distrotech/libvpx,felipebetancur/libvpx,shacklettbp/aom,abwiz0086/webm.libvpx,charup/https---github.com-webmproject-libvpx-,shareefalis/libvpx,n4t/libvpx,shyamalschandra/libvpx,running770/libvpx,charup/https---github.com-webmproject-libvpx-,mwgoldsmith/libvpx,mbebenita/aom,shacklettbp/aom,goodleixiao/vpx,luctrudeau/aom,altogother/webm.libvpx,jacklicn/webm.libvpx,Acidburn0zzz/webm.libvpx,Maria1099/webm.libvpx,iniwf/webm.libvpx,kim42083/webm.libvpx,thdav/aom,smarter/aom,ittiamvpx/libvpx,cinema6/libvpx,Suvarna1488/webm.libvpx,sanyaade-teachings/libvpx,n4t/libvpx,kleopatra999/webm.libvpx,cinema6/libvpx,webmproject/libvpx,Topopiccione/libvpx,Laknot/libvpx,kleopatra999/webm.libvpx,luctrudeau/aom,altogother/webm.libvpx,stewnorriss/libvpx,openpeer/libvpx_new,luctrudeau/aom,felipebetancur/libvpx,WebRTC-Labs/libvpx,smarter/aom,gshORTON/webm.libvpx,hsueceumd/test_hui,mwgoldsmith/vpx,matanbs/vp982,running770/libvpx,Maria1099/webm.libvpx,mwgoldsmith/libvpx,liqianggao/libvpx,openpeer/libvpx_new,kim42083/webm.libvpx,gshORTON/webm.libvpx,kleopatra999/webm.libvpx,zofuthan/libvpx,kalli123/webm.libvpx,shyamalschandra/libvpx,stewnorriss/libvpx,reimaginemedia/webm.libvpx,openpeer/libvpx_new,ittiamvpx/libvpx,Topopiccione/libvpx,WebRTC-Labs/libvpx,iniwf/webm.libvpx,charup/https---github.com-webmproject-libvpx-,Distrotech/libvpx,shacklettbp/aom,jdm/libvpx,Laknot/libvpx,mbebenita/aom,kalli123/webm.libvpx,Maria1099/webm.libvpx,matanbs/webm.libvpx,VTCSecureLLC/libvpx,mwgoldsmith/libvpx,cinema6/libvpx,mwgoldsmith/vpx,Distrotech/libvpx,jacklicn/webm.libvpx,gshORTON/webm.libvpx,Maria1099/webm.libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,abwiz0086/webm.libvpx,lyx2014/libvpx_c,ShiftMediaProject/libvpx,webmproject/libvpx,sanyaade-teachings/libvpx,liqianggao/libvpx,jdm/libvpx,iniwf/webm.libvpx,kim42083/webm.libvpx,kim42083/webm.libvpx,mwgoldsmith/libvpx,kalli123/webm.libvpx,lyx2014/libvpx_c,lyx2014/libvpx_c,thdav/aom,matanbs/webm.libvpx,thdav/aom,Distrotech/libvpx,GrokImageCompression/aom,thdav/aom,pcwalton/libvpx,turbulenz/libvpx,iniwf/webm.libvpx,mbebenita/aom,liqianggao/libvpx,jmvalin/aom,reimaginemedia/webm.libvpx,matanbs/webm.libvpx,zofuthan/libvpx,Suvarna1488/webm.libvpx,ittiamvpx/libvpx-1,zofuthan/libvpx,shyamalschandra/libvpx,VTCSecureLLC/libvpx,pcwalton/libvpx,altogother/webm.libvpx,VTCSecureLLC/libvpx,cinema6/libvpx,openpeer/libvpx_new,jmvalin/aom,ShiftMediaProject/libvpx,Topopiccione/libvpx,Acidburn0zzz/webm.libvpx,sanyaade-teachings/libvpx,Suvarna1488/webm.libvpx,jdm/libvpx,kleopatra999/webm.libvpx,Laknot/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,luctrudeau/aom,VTCSecureLLC/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,goodleixiao/vpx,mbebenita/aom,kim42083/webm.libvpx,shareefalis/libvpx,kalli123/webm.libvpx,liqianggao/libvpx,pcwalton/libvpx,turbulenz/libvpx,ittiamvpx/libvpx,altogother/webm.libvpx,WebRTC-Labs/libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,abwiz0086/webm.libvpx,kleopatra999/webm.libvpx,reimaginemedia/webm.libvpx,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,Laknot/libvpx,altogother/webm.libvpx,openpeer/libvpx_new,shacklettbp/aom,mbebenita/aom,GrokImageCompression/aom,Suvarna1488/webm.libvpx,hsueceumd/test_hui,jacklicn/webm.libvpx,pcwalton/libvpx,mwgoldsmith/vpx,matanbs/webm.libvpx,charup/https---github.com-webmproject-libvpx-,abwiz0086/webm.libvpx,turbulenz/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,hsueceumd/test_hui,kalli123/webm.libvpx,GrokImageCompression/aom,webmproject/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,kim42083/webm.libvpx,matanbs/vp982,matanbs/vp982,shacklettbp/aom,GrokImageCompression/aom,sanyaade-teachings/libvpx,luctrudeau/aom,goodleixiao/vpx,gshORTON/webm.libvpx,jdm/libvpx,GrokImageCompression/aom,altogother/webm.libvpx,Distrotech/libvpx,n4t/libvpx,Topopiccione/libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx-1,jmvalin/aom,mwgoldsmith/vpx,n4t/libvpx,lyx2014/libvpx_c,mwgoldsmith/libvpx,turbulenz/libvpx,Suvarna1488/webm.libvpx,turbulenz/libvpx,cinema6/libvpx,ittiamvpx/libvpx-1,abwiz0086/webm.libvpx,hsueceumd/test_hui,Laknot/libvpx,jmvalin/aom,mbebenita/aom,shyamalschandra/libvpx,running770/libvpx,stewnorriss/libvpx,ittiamvpx/libvpx-1,WebRTC-Labs/libvpx,gshORTON/webm.libvpx,hsueceumd/test_hui,Suvarna1488/webm.libvpx,ShiftMediaProject/libvpx,reimaginemedia/webm.libvpx,pcwalton/libvpx,Acidburn0zzz/webm.libvpx