Add #include first in Sk4x_* files

src/core/Sk4x_sse.h

 // It is important _not_ to put header guards here.
 // This file will be intentionally included three times.
 
 // Useful reading:
 //   https://software.intel.com/sites/landingpage/IntrinsicsGuide/
 
+#include "SkTypes.h"  // Keep this before any #ifdef for skbug.com/3362
+
 #if defined(SK4X_PREAMBLE)
     // Code in this file may assume SSE and SSE2.
     #include <emmintrin.h>
 
     // It must check for later instruction sets.
     #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
         #include <immintrin.h>
     #endif
 
     // A little bit of template metaprogramming to map
@@ skipping 156 matching lines @@
     }
     M(Sk4i) Max(const Sk4i& a, const Sk4i& b) {
         Sk4i less = a.lessThan(b);
         return b.bitAnd(less).bitOr(a.andNot(less));
     }
 #endif
 
 #undef M
 
 #endif//Method definitions.