bloom test check fail on arm (#5745)

Summary:
FullFilterBitsBuilder::CalculateSpace use CACHE_LINE_SIZE which is 64@X86 but 128@ARM64
when it run bloom_test.FullVaryingLengths it failed on ARM64 server,
the assert can be fixed by change  128->CACHE_LINE_SIZE*2 as merged
ASSERT_LE(FilterSize(), (size_t)((length * 10 / 8) + CACHE_LINE_SIZE * 2 + 5)) << length;

run  bloom_test
before fix:
/root/rocksdb-master/util/bloom_test.cc:281: Failure
Expected: (FilterSize()) <= ((size_t)((length * 10 / 8) + 128 + 5)), actual: 389 vs 383
200
[  FAILED  ] FullBloomTest.FullVaryingLengths (32 ms)
[----------] 4 tests from FullBloomTest (32 ms total)

[----------] Global test environment tear-down
[==========] 7 tests from 2 test cases ran. (116 ms total)
[  PASSED  ] 6 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] FullBloomTest.FullVaryingLengths

after fix:
Filters: 37 good, 0 mediocre
[       OK ] FullBloomTest.FullVaryingLengths (90 ms)
[----------] 4 tests from FullBloomTest (90 ms total)

[----------] Global test environment tear-down
[==========] 7 tests from 2 test cases ran. (174 ms total)
[  PASSED  ] 7 tests.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5745

Differential Revision: D17076047

fbshipit-source-id: e7beb5d55d4855fceb2b84bc8119a6b0759de635

util/bloom_test.cc

@@ -278,7 +278,7 @@ TEST_F(FullBloomTest, FullVaryingLengths) {
     }
     Build();
 
-    ASSERT_LE(FilterSize(), (size_t)((length * 10 / 8) + 128 + 5)) << length;
+    ASSERT_LE(FilterSize(), (size_t)((length * 10 / 8) + CACHE_LINE_SIZE * 2 + 5)) << length;
 
     // All added keys must match
     for (int i = 0; i < length; i++) {