Add missing AArch64 HWCAP_* and HWCAP2_* consts#1638

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JohnTitor merged 4 commits intorust-lang:masterfrom

linkmauve:getauxval

Feb 28, 2020

Commits on Feb 26, 2020

Commits on Feb 27, 2020

Comment out HWCAP2_* constants on AArch64
linkmauve
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