Introduce ARM Neon and SSE2 SIMD. #981

Job	Run time
Ruby memcheck	1m 6s
ruby-versions / Generate Ruby versions	4s
ubuntu-latest 2.7	50s
ubuntu-latest 3.0	24s
ubuntu-latest 3.1	27s
ubuntu-latest 3.2	24s
ubuntu-latest 3.3	29s
ubuntu-latest 3.4	31s
ubuntu-latest head	1m 19s
ubuntu-latest jruby	1m 12s
ubuntu-latest jruby-head	1m 15s
macos-14 2.7	47s
macos-14 3.0	20s
macos-14 3.1	23s
macos-14 3.2	16s
macos-14 3.3	17s
macos-14 3.4	18s
macos-14 head	17s
macos-14 jruby	38s
macos-14 jruby-head	1m 17s
windows-latest 2.7	4m 16s
windows-latest 3.0	2m 21s
windows-latest 3.1	2m 27s
windows-latest 3.2	2m 20s
windows-latest 3.3	2m 9s
windows-latest 3.4	4m 6s
windows-latest head	1m 23s
ubuntu-24.04-arm 3.4	37s
ubuntu-latest 3.4 JSON_DISABLE_SIMD=1	29s
macos-13 3.4	37s
windows-latest mswin	1m 14s
ubuntu-latest jruby-9.4	1m 5s
macos-latest truffleruby-head	29s
ubuntu-latest truffleruby-head	1m 52s
	37m 59s

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