RFR: 8362524: Fix confusing but harmless typos in x86 CPU Features

[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:
 - 8362524: Fix confusing but harmless typos in x86 CPU Features

Changes: https://git.openjdk.org/jdk/pull/26371/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362524
  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26371/head:pull/26371

PR: https://git.openjdk.org/jdk/pull/26371