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vpx_subpixel_8t_intrin_avx2: tolerate unversioned clang

assume __clang_major__==0 has the latest version of
_mm256_broadcastsi128_si256. fixes builds with custom clang toolchains.

BUG=b/30970831

Change-Id: I90becd56278e4716bd46e2ba9d910af977e8dfa6

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

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

@@ -36,11 +36,11 @@

 };

 #if defined(__clang__)

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

-    (defined(__APPLE__) && defined(__apple_build_version__) &&               \

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

+#if (__clang_major__ > 0 && __clang_major__ < 3) ||            \

+    (__clang_major__ == 3 && __clang_minor__ <= 3) ||          \

+    (defined(__APPLE__) && defined(__apple_build_version__) && \

+     ((__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.