RFR: 8255799: AArch64: CPU_A53MAC feature may be set incorrectly

[Andrew Haley]

On Thu, 5 Nov 2020 21:29:37 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> Follow-up patch for PR #1039. As clarified by @nick-arm, CPU_A53MAC was set to workaround old Linux bug when A53 cores may be available if only a single A57 core is reported in /proc/cpuinfo. The workaround was broken recently but the bug is assumed to be fixed everywhere, so the workaround can be removed completely.
> 
> CCing old participants: @theRealAph @adinn

Marked as reviewed by aph (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/1084