ubsan shift fixes

src/effects/gradients/SkGradientShaderPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGradientShaderPriv_DEFINED
 #define SkGradientShaderPriv_DEFINED
 
@@ skipping 40 matching lines @@
 
 // Mirror
 
 // 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)
 #pragma optimize("", off)
 #endif
 
 static inline SkFixed mirror_tileproc(SkFixed x) {
-    int s = x << 15 >> 31;
+    int s = SkLeftShift(x, 15) >> 31;
     return (x ^ s) & 0xFFFF;
 }
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1600)
 #pragma optimize("", on)
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 typedef SkFixed (*TileProc)(SkFixed);
@@ skipping 384 matching lines @@
     GrGLSLProgramDataManager::UniformHandle fColorStartUni;
     GrGLSLProgramDataManager::UniformHandle fColorMidUni;
     GrGLSLProgramDataManager::UniformHandle fColorEndUni;
 
     typedef GrGLSLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif