[crac] RFR: 8372933: [CRaC] Restore failed due to incompatible or missing CPU features, try using -XX:CPUFeatures=0xfoo, 0xbar on checkpoint [v7]

[Jan Kratochvil]

> Since [JDK-8368929](https://bugs.openjdk.org/browse/JDK-8368929) the message:
> 
> 
> Restore failed due to incompatible or missing CPU features, try using -XX:CPUFeatures=0xe14e1805fdfbf7,0xfcc on checkpoint.
> 
> 
> is wrong as it does not do logical and of both CPUFeatures masks.
> 
> Yes, I should have caught it during [JDK-8368929](https://bugs.openjdk.org/browse/JDK-8368929) review.
> 
> @rvansa will probably want to change the API but this is a PoC how it should work.

Jan Kratochvil has updated the pull request incrementally with three additional commits since the last revision:

 - Use current_features everywhere
 - Fix "try using -XX:CPUFeatures" for the 'exact' case.
 - Check for failed malloc

-------------

Changes:
  - all: https://git.openjdk.org/crac/pull/278/files
  - new: https://git.openjdk.org/crac/pull/278/files/90633b09..b447735d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=278&range=06
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=278&range=05-06

  Stats: 26 lines in 4 files changed: 7 ins; 0 del; 19 mod
  Patch: https://git.openjdk.org/crac/pull/278.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/278/head:pull/278

PR: https://git.openjdk.org/crac/pull/278