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Upstream Mozilla fix for older Apple clang builds

Also use the _mm_broadcastsi128_si256 intrisic for
Apple clang versions 4.[012]

https://bugzilla.mozilla.org/show_bug.cgi?id=1085607
https://code.google.com/p/webm/issues/detail?id=1082

Change-Id: I6bc821d8163387194ef663e94bfed91fa7281d88

--- a/vpx_dsp/x86/vpx_subpixel_8t_intrin_avx2.c

+++ b/vpx_dsp/x86/vpx_subpixel_8t_intrin_avx2.c

@@ -41,7 +41,10 @@

 #if defined(__clang__)

 # if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ <= 3) || \

-      (defined(__APPLE__) && __clang_major__ == 5 && __clang_minor__ == 0)

+    (defined(__APPLE__) && \

+        ((__clang_major__ == 4 && __clang_minor__ <= 2) || \

+            (__clang_major__ == 5 && __clang_minor__ == 0)))

+

 #  define MM256_BROADCASTSI128_SI256(x) \

        _mm_broadcastsi128_si256((__m128i const *)&(x))

 # else  // clang > 3.3, and not 5.0 on macosx.