Fix alignment problems in NEON Sk4b.

src/opts/SkNx_neon.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkNx_neon_DEFINED
 #define SkNx_neon_DEFINED
 
@@ skipping 278 matching lines @@
     SkNx thenElse(const SkNx& t, const SkNx& e) const {
         return vbslq_u16(fVec, t.fVec, e.fVec);
     }
 
     uint16x8_t fVec;
 };
 
 template <>
 class SkNx<4, uint8_t> {
 public:
+    typedef uint32_t __attribute__((aligned(1))) unaligned_uint32_t;
+
     SkNx(const uint8x8_t& vec) : fVec(vec) {}
 
     SkNx() {}
     SkNx(uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
         fVec = (uint8x8_t){a,b,c,d, 0,0,0,0};
     }
     static SkNx Load(const void* ptr) {
-        return (uint8x8_t)vld1_dup_u32((const uint32_t*)ptr);
+        return (uint8x8_t)vld1_dup_u32((const unaligned_uint32_t*)ptr);
     }
     void store(void* ptr) const {
-        return vst1_lane_u32((uint32_t*)ptr, (uint32x2_t)fVec, 0);
+        return vst1_lane_u32((unaligned_uint32_t*)ptr, (uint32x2_t)fVec, 0);
     }
     uint8_t operator[](int k) const {
         SkASSERT(0 <= k && k < 4);
         union { uint8x8_t v; uint8_t us[8]; } pun = {fVec};
         return pun.us[k&3];
     }
 
     // TODO as needed
 
     uint8x8_t fVec;
@@ skipping 176 matching lines @@
     uint16x4x4_t rgba = {{
         r.fVec,
         g.fVec,
         b.fVec,
         a.fVec,
     }};
     vst4_u16((uint16_t*) dst, rgba);
 }
 
 #endif//SkNx_neon_DEFINED