Disable bench that's crashing on ChromeOS/Alex perf bot.

bench/MemcpyBench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkRandom.h"
 #include "SkTemplates.h"
@@ skipping 124 matching lines @@
 
         count -= 16;
     }
 
     dst = reinterpret_cast<uint32_t*>(dst128);
     src = reinterpret_cast<const uint32_t*>(src128);
     while (count --> 0) {
         *dst++ = *src++;
     }
 }
-BENCH(memcpy32_sse2_unalign, 10)
+// skia:2589: Crashing on ChromeOS Alex bot.  TODO(mtklein): why?
+//BENCH(memcpy32_sse2_unalign, 10)
 BENCH(memcpy32_sse2_unalign, 100)
 BENCH(memcpy32_sse2_unalign, 1000)
 BENCH(memcpy32_sse2_unalign, 10000)
 BENCH(memcpy32_sse2_unalign, 100000)
 
 #endif // SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
 
 #undef BENCH