CacheLocalityTest.Basic on Windows

Summary:
max_align_t is usually 8 on Windows, so fix this unit test which
assumes 16-byte alignment.

Reviewed By: Orvid

Differential Revision: D44726286

fbshipit-source-id: 3662000c4e55177d690d3aeb47fed817812ec893

folly/concurrency/test/CacheLocalityTest.cpp

@@ -1150,11 +1150,13 @@ TEST(CoreAllocator, Basic) {
   coreFree(res);
 
   res = coreMalloc(8, kNumStripes, 0);
-  EXPECT_TRUE((intptr_t)res % 8 == 0); // check alignment
+  EXPECT_EQ(0, (intptr_t)res % 8); // check alignment
   memset(res, 0, 8);
   coreFree(res);
   res = coreMalloc(12, kNumStripes, 0);
-  EXPECT_TRUE((intptr_t)res % 16 == 0); // check alignment
+  if (alignof(std::max_align_t) >= 16) {
+    EXPECT_EQ(0, (intptr_t)res % 16); // check alignment
+  }
   memset(res, 0, 12);
   coreFree(res);
   res = coreMalloc(257, kNumStripes, 0);