RFR: 8295844: jdk/test/whitebox/CPUInfoTest.java failed with "not all features are known: expected true, was false"

[Vladimir Kozlov]

[JDK-8295776](https://github.com/openjdk/jdk/commit/d50b6eb342e9ec96d1a01dafc317e00725dc84c0) added new x86 CPU flags checks but did not update  CPUInfoTest.java.
Add missing x86 CPU's flags to CPUInfoTest.java.

Tested with tier1 when CPUInfoTest.java is ran.

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Commit messages:
 - Update comment
 - Added comment and aligned flags
 - 8295844: jdk/test/whitebox/CPUInfoTest.java failed with "not all features are known: expected true, was false"

Changes: https://git.openjdk.org/jdk/pull/10837/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10837&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295844
  Stats: 7 lines in 2 files changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10837.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10837/head:pull/10837

PR: https://git.openjdk.org/jdk/pull/10837