RFR: 8349070: Fix riscv and ppc build errors caused by JDK-8343767 [v2]

[Andrew Dinn]

> 8349070: Fix riscv and ppc build errors caused by JDK-8343767

Andrew Dinn has updated the pull request incrementally with two additional commits since the last revision:

 - use correct name for riscv lookup routine
 - use correct name for ppc lookup routine

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23368/files
  - new: https://git.openjdk.org/jdk/pull/23368/files/9a819441..7a56c804

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23368&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23368&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/23368.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23368/head:pull/23368

PR: https://git.openjdk.org/jdk/pull/23368