RFR: 8315578: PPC builds are broken after JDK-8304913 [v3]

[Aleksey Shipilev]

> Similar to other issues in the same area. I have no PPC32 machine to test the build on, but this matches other fixes for other architectures (https://github.com/openjdk/jdk/commit/83c096d6e20cd6e1164bc666df1be197a10431eb) after this fix the PPC32 Zero build completes fine.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Revert "Switch to PPC32"
  
  This reverts commit d829d243f94560dc19699d36b67a73280817b8f6.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15556/files
  - new: https://git.openjdk.org/jdk/pull/15556/files/d829d243..df419e36

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15556&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15556&range=01-02

  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/15556.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15556/head:pull/15556

PR: https://git.openjdk.org/jdk/pull/15556