Remove dead code.

src/opts/SkMath_opts_SSE2.h

-/*
- * Copyright 2014 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkMath_opts_SSE2_DEFINED
-#define SkMath_opts_SSE2_DEFINED
-
-#include <emmintrin.h>
-
-// Because no _mm_div_epi32() in SSE2, we use float division to emulate.
-// When using this function, make sure a and b don't exceed float's precision.
-static inline __m128i shim_mm_div_epi32(const __m128i& a, const __m128i& b) {
-    __m128 x = _mm_cvtepi32_ps(a);
-    __m128 y = _mm_cvtepi32_ps(b);
-    return _mm_cvttps_epi32(_mm_div_ps(x, y));
-}
-
-// Portable version of SkSqrtBits is in SkMath.cpp.
-static inline __m128i SkSqrtBits_SSE2(const __m128i& x, int count) {
-    __m128i root =  _mm_setzero_si128();
-    __m128i remHi = _mm_setzero_si128();
-    __m128i remLo = x;
-    __m128i one128 = _mm_set1_epi32(1);
-
-    do {
-        root = _mm_slli_epi32(root, 1);
-
-        remHi = _mm_or_si128(_mm_slli_epi32(remHi, 2),
-                             _mm_srli_epi32(remLo, 30));
-        remLo = _mm_slli_epi32(remLo, 2);
-
-        __m128i testDiv = _mm_slli_epi32(root, 1);
-        testDiv = _mm_add_epi32(testDiv, _mm_set1_epi32(1));
-
-        __m128i cmp = _mm_cmplt_epi32(remHi, testDiv);
-        __m128i remHi1 = _mm_and_si128(cmp, remHi);
-        __m128i root1 = _mm_and_si128(cmp, root);
-        __m128i remHi2 = _mm_andnot_si128(cmp, _mm_sub_epi32(remHi, testDiv));
-        __m128i root2 = _mm_andnot_si128(cmp, _mm_add_epi32(root, one128));
-
-        remHi = _mm_or_si128(remHi1, remHi2);
-        root = _mm_or_si128(root1, root2);
-    } while (--count >= 0);
-
-    return root;
-}
-
-#endif // SkMath_opts_SSE2_DEFINED