RFR: 8290082: [PPC64] ZGC C2 load barrier stub needs to preserve vector registers [v5]

[Martin Doerr]

> Preserve volatile vector registers in ZGC C2 load barrier stub.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo in comment.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/9453/files
  - new: https://git.openjdk.org/jdk/pull/9453/files/f6d238ed..fab3fa4a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9453&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9453&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9453.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9453/head:pull/9453

PR: https://git.openjdk.org/jdk/pull/9453