RFR: 8376113: PPC64: Implement special MachNodes for floating point Min / Max [v4]

[David Briemann]

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

David Briemann has updated the pull request incrementally with one additional commit since the last revision:

  add missing format strings, enable IR matching for >= PPC9 in TestMinMaxIdentity.java

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29361/files
  - new: https://git.openjdk.org/jdk/pull/29361/files/c4417170..4621017d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29361&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29361&range=02-03

  Stats: 9 lines in 3 files changed: 7 ins; 0 del; 2 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