RFR: 8376113: PPC64: Implement special MachNodes for floating point Min / Max [v3]

[David Briemann]

> Add mach nodes MinF, MaxF, MinD, MaxD for PPC.

David Briemann has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - add match_rule_supported check for MinF, MaxF, MinD, MaxD and PPC >= 9
 - 8376113: PPC64: Implement special MachNodes for floating point Min / Max

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Changes: https://git.openjdk.org/jdk/pull/29361/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29361&range=02
  Stats: 63 lines in 3 files changed: 63 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29361.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29361/head:pull/29361

PR: https://git.openjdk.org/jdk/pull/29361