Make gMask_00FF00FF a constant

src/opts/SkColor_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 SkColor_opts_SSE2_DEFINED
 #define SkColor_opts_SSE2_DEFINED
 
@@ skipping 24 matching lines @@
     __m128i prod = _mm_mullo_epi16(a, b);
     prod = _mm_add_epi32(prod, _mm_set1_epi32(128));
     prod = _mm_add_epi32(prod, _mm_srli_epi32(prod, 8));
     prod = _mm_srli_epi32(prod, 8);
 
     return prod;
 }
 
 // Portable version SkAlphaMulQ is in SkColorPriv.h.
 static inline __m128i SkAlphaMulQ_SSE2(const __m128i& c, const __m128i& scale) {
-    __m128i mask = _mm_set1_epi32(gMask_00FF00FF);
+    __m128i mask = _mm_set1_epi32(0xFF00FF);
     __m128i s = _mm_or_si128(_mm_slli_epi32(scale, 16), scale);
 
     // uint32_t rb = ((c & mask) * scale) >> 8
     __m128i rb = _mm_and_si128(mask, c);
     rb = _mm_mullo_epi16(rb, s);
     rb = _mm_srli_epi16(rb, 8);
 
     // uint32_t ag = ((c >> 8) & mask) * scale
     __m128i ag = _mm_srli_epi16(c, 8);
     ag = _mm_and_si128(ag, mask);
@@ skipping 121 matching lines @@
     b2 = _mm_and_si128(b2, _mm_set1_epi32(SK_B16_MASK));
     __m128i b = _mm_packs_epi32(b1, b2);
 
     // Store 8 16-bit colors in dst.
     __m128i d_pixel = SkPackRGB16_SSE2(r, g, b);
 
     return d_pixel;
 }
 
 #endif // SkColor_opts_SSE2_DEFINED