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vp9: remove another optimization branch in iadst16 which causes overflows.
See sample vp90-2-14-resize-fp-tiles-16-8.webm from the vp9 test vector set to reproduce the issue.
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@ -1622,7 +1622,9 @@ VP9_IDCT_IDCT_16x16_ADD_XMM avx
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PSIGNW m3, [pw_m1] ; m3=out1[w], m7=t10[w]
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SUMSUB_BA w, 2, 6, 1 ; m2=out14[w], m6=t11[w]
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%if cpuflag(ssse3)
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; unfortunately, the code below overflows in some cases, e.g.
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; http://downloads.webmproject.org/test_data/libvpx/vp90-2-14-resize-fp-tiles-16-8.webm
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%if 0; cpuflag(ssse3)
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SUMSUB_BA w, 7, 6, 1
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pmulhrsw m7, [pw_11585x2] ; m7=out6[w]
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pmulhrsw m6, [pw_11585x2] ; m6=out9[w]
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