Commits on Jun 2, 2021

1. cpufeatures: map aarch64 HWCAPs to target features; add crypto …

   Closes #395
   
   The HWCAPs provided by Linux are finer-grained than LLVM target
   features. This crate is trying to detect the latter, so we need to group
   together these finer grained features detected via HWCAPs.
   
   This commit attempts to group together finer grained HWCAPs into coarser
   grained target features, ensuring all of the relevant HWCAPs for a given
   target feature are available.
   
   Additionally, this adds support for the `crypto` target feature, which
   implies `aes` (and with it PMULL), along with `sha2` and `neon`
   (although the latter is always present on `aarch64`)

   

   tarcieri committed Jun 2, 2021
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