RFR: 8293351: Add second tmp register to aarch64 BarrierSetAssembler::load_at

Mon Sep 5 10:16:26 UTC 2022

Add a second tmp register to the BarrierSetAssembler::load_at GC API for aarch64.

Today G1 and Shenandoah uses a second temporary register. This will also be the case for generational ZGC.

Testing: Oracle platforms tier 1-3

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Commit messages:
 - 8293351: Add second tmp register to aarch64 BarrierSetAssembler::load_at

Changes: https://git.openjdk.org/jdk/pull/10161/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10161&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293351
  Stats: 88 lines in 14 files changed: 7 ins; 2 del; 79 mod
  Patch: https://git.openjdk.org/jdk/pull/10161.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10161/head:pull/10161

PR: https://git.openjdk.org/jdk/pull/10161