Commits on Sep 4, 2021

1. Use the 64b inner:monotonize() implementation not the 128b one for aa… …

   …rch64
   
   aarch64 prior to v8.4 (FEAT_LSE2) doesn't have an instruction that guarantees
   untorn 128b reads except for completing a 128b load/store exclusive pair
   (ldxp/stxp) or compare-and-swap (casp) successfully. The requirement to
   complete a 128b read+write atomic is actually more expensive and more unfair
   than the previous implementation of monotonize() which used a Mutex on aarch64,
   especially at large core counts.  For aarch64 switch to the 64b atomic
   implementation which is about 13x faster for a benchmark that involves many
   calls to Instant::now().

   

   AGSaidi committed Sep 4, 2021
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