[crac] RFR: GLIBC->CPU flags optimization [v2]

[Jan Kratochvil]

> Reduce the number of `GLIBC_*` flags when it can use existing `CPU_*` flags.
> This patch was split out of PR #136.
> 
> 
>  2 files changed, 9 insertions(+), 17 deletions(-)
> 
> So I find it clearly an improvement.
> As an explanation: I created the GLIBC_* namespace in addition to the existing upstream CPU_* namespace. And some my additions in GLIBC_* namespace have now appeared by https://github.com/openjdk/jdk/commit/d50b6eb342e9ec96d1a01dafc317e00725dc84c0 also in the upstream CPU_* namespace. They were missing in the CPU_* namespace when I was implementing it. So we can remove the duplicity from GLIBC_* namespace.

Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'crac' into crac-glibccpureduction
 - GLIBC->CPU flags optimization

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

Changes:
  - all: https://git.openjdk.org/crac/pull/139/files
  - new: https://git.openjdk.org/crac/pull/139/files/5f77d82b..f6b372e2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=139&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=139&range=00-01

  Stats: 277 lines in 15 files changed: 190 ins; 31 del; 56 mod
  Patch: https://git.openjdk.org/crac/pull/139.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/139/head:pull/139

PR: https://git.openjdk.org/crac/pull/139