ARROW-5567: [C++] Fix build error of memory-benchmark
ARROW-5567: [C++] Fix build error of memory-benchmark

'memory-benchmark.cc' is implemented by x86 AVX and SSE instructions.
Build would failed on Arm64 when DARROW_BUILD_BENCHMARKS is enabled.

Author: Yuqi Gu <yuqi.gu@arm.com>
Author: Wes McKinney <wesm+git@apache.org>

Closes #4528 from guyuqi/ARROW-5567 and squashes the following commits:

b058450aa <Wes McKinney> Rely on arrow/util/sse-util.h for SSE4.2-related flags and includes
52bf6ed7e <Yuqi Gu> Use Macro __SSE4_2__
8cc81e89e <Yuqi Gu> Fix build error of memory-benchmark

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