RFR: 8251358: Clean up Access configuration after Shenandoah barrier change

Mon Sep 14 05:25:04 UTC 2020

This change removes a bunch of code that is no longer necessary after the Shenandoah barrier changes, including the
`SUPPORT` macros in barrierSetConfig.hpp and code using them. `Access::resolve` and associated code have also been
removed, and callers have been modified.

Testing done:
tier1
hotspot_gc_shenandoah

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Commit messages:
 - 8251358: Clean up Access configuration after Shenandoah barrier change

Changes: https://git.openjdk.java.net/jdk/pull/146/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=146&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251358
  Stats: 64 lines in 8 files changed: 0 ins; 57 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/146.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/146/head:pull/146

PR: https://git.openjdk.java.net/jdk/pull/146