[crac] RFR: Fix confusing but harmless typos

[Jan Kratochvil]

The name `DECLARE_CPU_FEATURE_FLAG` is used in all other cases. In `vmStructs_jvmci.cpp` there was no matching `#define`.

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Commit messages:
 - Fix confusing but harmless typos

Changes: https://git.openjdk.org/crac/pull/245/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=245&range=00
  Stats: 4 lines in 2 files changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/crac/pull/245.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/245/head:pull/245

PR: https://git.openjdk.org/crac/pull/245