Consistently use FMA in neon butterfly3 #289

Job	Run time
Check+Test default features (stable)	1m 15s
Check and test WebAssembly with SIMD (stable)	1m 18s
Check+Test no features (stable)	33s
Check+Test default features (beta)	1m 19s
Check and test Linux arm 64bit with neon (stable)	1m 51s
Check and test WebAssembly with SIMD (beta)	58s
Check+Test no features (beta)	42s
Check+Test default features (nightly)	1m 23s
Check and test Linux arm 64bit with neon (beta)	1m 48s
Check and test WebAssembly with SIMD (nightly)	1m 5s
Check+Test no features (nightly)	39s
Check+Test default features (1.61)	4m 57s
Check and test Linux arm 64bit with neon (nightly)	2m 50s
Check and test WebAssembly with SIMD (1.61)	4m 10s
Check+Test no features (1.61)	4m 8s
Check and test Linux arm 64bit with neon (1.61)	5m 29s
Check and test Linux x86 32bit	1m 33s
Rustfmt	17s
	36m 15s

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