Add sk_careful_memcpy to catch undefined behavior in memcpy.

bench/MathBench.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkColorPriv.h"
 #include "SkMatrix.h"
@@ skipping 108 matching lines @@
         for (int i = 0; i < count; ++i) {
             dst[i] = 1.0f / sk_float_sqrt(src[i]);
         }
     }
 private:
     typedef MathBench INHERITED;
 };
 
 static inline float SkFastInvSqrt(float x) {
     float xhalf = 0.5f*x;
-    int i = *SkTCast<int*>(&x);
+    uint32_t i = *SkTCast<uint32_t*>(&x);
     i = 0x5f3759df - (i>>1);
     x = *SkTCast<float*>(&i);
     x = x*(1.5f-xhalf*x*x);
 //    x = x*(1.5f-xhalf*x*x); // this line takes err from 10^-3 to 10^-6
     return x;
 }
 
 class FastISqrtMathBench : public MathBench {
 public:
     FastISqrtMathBench() : INHERITED("fastIsqrt") {}
@@ skipping 459 matching lines @@
 
 DEF_BENCH( return new FloorBench(false); )
 DEF_BENCH( return new FloorBench(true); )
 
 DEF_BENCH( return new CLZBench(false); )
 DEF_BENCH( return new CLZBench(true); )
 
 DEF_BENCH( return new NormalizeBench(); )
 
 DEF_BENCH( return new FixedMathBench(); )