Fix : ELEMENTS_PER_BLOCK may be incorrect #1007

Job	Run time
clang-compile-with-bazel-all-options	16m 46s
clang-compile-with-bazel	14m 2s
clang-compile-with-boringssl	20m 18s
clang-compile-with-cmake	2m 35s
clang-compile-with-make	3m 4s
clang-compile-with-cmake-all-options	5m 3s
clang-compile-with-make-all-options	4m 49s
clang-unittest	14m 45s
gcc-compile-with-bazel-all-options	18m 45s
gcc-compile-with-bazel	15m 55s
gcc-compile-with-boringssl	19m 37s
gcc-compile-with-cmake	3m 28s
gcc-compile-with-cmake-all-options	5m 23s
gcc-compile-with-make	2m 42s
gcc-compile-with-make-all-options	4m 27s
	2h 31m 39s

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