Remove SkNx AVX code. It is not really used. Getting in the way of refactoring.

src/opts/SkNx_avx.h

Index: src/opts/SkNx_avx.h
diff --git a/src/opts/SkNx_avx.h b/src/opts/SkNx_avx.h
deleted file mode 100644
index 85a21105375eca7d7f24cbe64868f40746a3e87d..0000000000000000000000000000000000000000
--- a/src/opts/SkNx_avx.h
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkNx_avx_DEFINED
-#define SkNx_avx_DEFINED
-
-// This file may assume <= AVX, but must check SK_CPU_SSE_LEVEL for anything more recent.
-
-// All the SSE specializations are still good ideas.  We'll just add Sk8f.
-#include "SkNx_sse.h"
-
-// SkNx_sse.h defines SKNX_IS_FAST.
-
-namespace {  // See SkNx.h
-
-template <>
-class SkNx<8, float> {
-public:
-    SkNx(const __m256& vec) : fVec(vec) {}
-
-    SkNx() {}
-    SkNx(float val) : fVec(_mm256_set1_ps(val)) {}
-    static SkNx Load(const void* ptr) { return _mm256_loadu_ps((const float*)ptr); }
-
-    SkNx(float a, float b, float c, float d,
-         float e, float f, float g, float h) : fVec(_mm256_setr_ps(a,b,c,d,e,f,g,h)) {}
-
-    void store(void* ptr) const { _mm256_storeu_ps((float*)ptr, fVec); }
-
-    SkNx operator + (const SkNx& o) const { return _mm256_add_ps(fVec, o.fVec); }
-    SkNx operator - (const SkNx& o) const { return _mm256_sub_ps(fVec, o.fVec); }
-    SkNx operator * (const SkNx& o) const { return _mm256_mul_ps(fVec, o.fVec); }
-    SkNx operator / (const SkNx& o) const { return _mm256_div_ps(fVec, o.fVec); }
-
-    SkNx operator == (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_EQ_OQ); }
-    SkNx operator != (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_NEQ_OQ); }
-    SkNx operator  < (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_LT_OQ); }
-    SkNx operator  > (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_GT_OQ); }
-    SkNx operator <= (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_LE_OQ); }
-    SkNx operator >= (const SkNx& o) const { return _mm256_cmp_ps(fVec, o.fVec, _CMP_GE_OQ); }
-
-    static SkNx Min(const SkNx& l, const SkNx& r) { return _mm256_min_ps(l.fVec, r.fVec); }
-    static SkNx Max(const SkNx& l, const SkNx& r) { return _mm256_max_ps(l.fVec, r.fVec); }
-
-    SkNx  sqrt() const { return _mm256_sqrt_ps (fVec);  }
-    SkNx rsqrt0() const { return _mm256_rsqrt_ps(fVec); }
-    SkNx rsqrt1() const { return this->rsqrt0(); }
-    SkNx rsqrt2() const { return this->rsqrt1(); }
-
-    SkNx       invert() const { return SkNx(1) / *this; }
-    SkNx approxInvert() const { return _mm256_rcp_ps(fVec); }
-
-    template <int k> float kth() const {
-        SkASSERT(0 <= k && k < 8);
-        union { __m256 v; float fs[8]; } pun = {fVec};
-        return pun.fs[k&7];
-    }
-
-    bool allTrue() const { return 0xff == _mm256_movemask_ps(fVec); }
-    bool anyTrue() const { return 0x00 != _mm256_movemask_ps(fVec); }
-
-    SkNx thenElse(const SkNx& t, const SkNx& e) const {
-        return _mm256_blendv_ps(e.fVec, t.fVec, fVec);
-    }
-
-    __m256 fVec;
-};
-
-template<> inline Sk8b SkNx_cast<uint8_t, float, 8>(const Sk8f& src) {
-    __m256i _32 = _mm256_cvttps_epi32(src.fVec);
-    __m128i  lo = _mm256_extractf128_si256(_32, 0),
-             hi = _mm256_extractf128_si256(_32, 1),
-            _16 = _mm_packus_epi32(lo, hi);
-    return _mm_packus_epi16(_16, _16);
-}
-
-template<> inline Sk8f SkNx_cast<float, uint8_t, 8>(const Sk8b& src) {
-    /* TODO lo = _mm_cvtepu8_epi32(src.fVec),
-     *      hi = _mm_cvtepu8_epi32(_mm_srli_si128(src.fVec, 4))
-     */
-    __m128i _16 = _mm_unpacklo_epi8(src.fVec, _mm_setzero_si128()),
-             lo = _mm_unpacklo_epi16(_16, _mm_setzero_si128()),
-             hi = _mm_unpackhi_epi16(_16, _mm_setzero_si128());
-    __m256i _32 = _mm256_insertf128_si256(_mm256_castsi128_si256(lo), hi, 1);
-    return _mm256_cvtepi32_ps(_32);
-}
-
-}  // namespace
-
-#endif//SkNx_avx_DEFINED