RFR: 8343964: RISC-V: Improve PrintOptoAssembly output for loadNKlassCompactHeaders node

[Fei Yang]

Hi, please review this small change.

Currently, we print a simple `lwu` for this node, which is not accurate becasue we do a `ld` and logic shift right the loaded 64-bit value for this node. This simply changed it into `load_narrow_klass_compact` like other CPU platforms. After this change, we have:


070     B2: #   out( B8 B3 ) <- in( B1 )  Freq: 0.9
070 +   load_narrow_klass_compact R28, [R12, #4]        # compressed class ptr, #@loadNKlassCompactHeaders


(Tagging: @Hamlin-Li)

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Commit messages:
 - 8343964: RISC-V: Improve PrintOptoAssembly output for loadNKlassCompactHeaders node

Changes: https://git.openjdk.org/jdk/pull/22025/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22025&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343964
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/22025.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22025/head:pull/22025

PR: https://git.openjdk.org/jdk/pull/22025