RFR: 8302776: Fix typo CSR_INSTERT to CSR_INSTRET

[Ludovic Henry]

8302776: Fix typo CSR_INSTERT to CSR_INSTRET

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Commit messages:
 - 8302776: Fix typo CSR_INSTERT to CSR_INSTRET

Changes: https://git.openjdk.org/jdk/pull/12616/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12616&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302776
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12616.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12616/head:pull/12616

PR: https://git.openjdk.org/jdk/pull/12616