Remove version checks for _MSC_VER < 1800 (msvs2013).

src/effects/gradients/SkLinearGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk4fLinearGradient.h"
 #include "SkLinearGradient.h"
 
 // define to test the 4f gradient path
 // #define FORCE_4F_CONTEXT
 
 static const float kInv255Float = 1.0f / 255;
 
 static inline int repeat_8bits(int x) {
     return x & 0xFF;
 }
 
-// Visual Studio 2010 (MSC_VER=1600) optimizes bit-shift code incorrectly.
-// See http://code.google.com/p/skia/issues/detail?id=472
-#if defined(_MSC_VER) && (_MSC_VER >= 1600)

[mtklein, 2016/03/10 17:37:48]

ditto

-#pragma optimize("", off)
-#endif
-
 static inline int mirror_8bits(int x) {
     if (x & 256) {
         x = ~x;
     }
     return x & 255;
 }
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1600)
-#pragma optimize("", on)
-#endif
-
 static SkMatrix pts_to_unit_matrix(const SkPoint pts[2]) {
     SkVector    vec = pts[1] - pts[0];
     SkScalar    mag = vec.length();
     SkScalar    inv = mag ? SkScalarInvert(mag) : 0;
 
     vec.scale(inv);
     SkMatrix matrix;
     matrix.setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY);
     matrix.postTranslate(-pts[0].fX, -pts[0].fY);
     matrix.postScale(inv, inv);
@@ skipping 713 matching lines @@
             this->shade4_dx_clamp<false, true>(dstC, count, fx, dx, invDx, dither);
         }
     } else {
         if (fApplyAlphaAfterInterp) {
             this->shade4_dx_clamp<true, false>(dstC, count, fx, dx, invDx, dither);
         } else {
             this->shade4_dx_clamp<false, false>(dstC, count, fx, dx, invDx, dither);
         }
     }
 }