message: Replace ARCH_K8 with __x86_64__.
diff: @@ -92,7 +92,7 @@ TEST(ManualConstructorTest, Alignment) {
  EXPECT_EQ(reinterpret_cast<char*>(test2.b.get()) - &test2.a,
  reinterpret_cast<char*>(&control2.b) - &control2.a);
  -#ifdef ARCH_K8
  +#ifdef __x86_64__
  EXPECT_EQ(reinterpret_cast<intptr_t>(test2.b.get()) % 16, 0);
  #endif
  }
  