[jdk21u-dev] RFR: 8324123: aarch64: fix prfm literal encoding in assembler

[Liang Mao]

Clean backport of fix of aarch64 PRFM (literal) encoding. 

Additional testing:
 - [x] Linux aarch64 server fastdebug, tier1

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Commit messages:
 - Backport bde87895c8b1b9df198e3883d24cd9ea840efc98

Changes: https://git.openjdk.org/jdk21u-dev/pull/299/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=299&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324123
  Stats: 33 lines in 2 files changed: 22 ins; 11 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/299.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/299/head:pull/299

PR: https://git.openjdk.org/jdk21u-dev/pull/299