Reorganize to keep similar code together.

src/opts/SkOpts_sse2.cpp

Index: src/opts/SkOpts_sse2.cpp
diff --git a/src/opts/SkOpts_sse2.cpp b/src/opts/SkOpts_sse2.cpp
index 5b4d6d686f2466f1a974cddde3731bcff79a801c..ef0f96a0a117c742a3bc0657db77cb731357e1f5 100644
--- a/src/opts/SkOpts_sse2.cpp
+++ b/src/opts/SkOpts_sse2.cpp
@@ -9,48 +9,9 @@
 
 #define SK_OPTS_NS sse2
 #include "SkBlurImageFilter_opts.h"
+#include "SkUtils_opts.h"
 #include "SkXfermode_opts.h"
 
-namespace sse2 {  // This helps identify methods from this file when debugging / profiling.
-
-static void memset16(uint16_t* dst, uint16_t val, int n) {
-    auto dst8 = (__m128i*)dst;
-    auto val8 = _mm_set1_epi16(val);
-    for ( ; n >= 8; n -= 8) {
-        _mm_storeu_si128(dst8++, val8);
-    }
-    dst = (uint16_t*)dst8;
-    if (n & 4) {
-        _mm_storel_epi64((__m128i*)dst, val8);
-        dst += 4;
-    }
-    if (n & 2) {
-        *(uint32_t*)dst = _mm_cvtsi128_si32(val8);
-        dst += 2;
-    }
-    if (n & 1) {
-        *dst = val;
-    }
-}
-
-static void memset32(uint32_t* dst, uint32_t val, int n) {
-    auto dst4 = (__m128i*)dst;
-    auto val4 = _mm_set1_epi32(val);
-    for ( ; n >= 4; n -= 4) {
-        _mm_storeu_si128(dst4++, val4);
-    }
-    dst = (uint32_t*)dst4;
-    if (n & 2) {
-        _mm_storel_epi64((__m128i*)dst, val4);
-        dst += 2;
-    }
-    if (n & 1) {
-        *dst = val;
-    }
-}
-
-}  // namespace sse2
-
 namespace SkOpts {
     void Init_sse2() {
         memset16        = sse2::memset16;