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

Thu Nov 5 21:34:00 UTC 2020

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

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Commit messages:
 - Remove CPU_A53MAC assumption based on number of CPUs

Changes: https://git.openjdk.java.net/jdk/pull/1084/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1084&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255799
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1084.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1084/head:pull/1084

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