RFR: 8320069: RISC-V: Add Zcb instructions

[Robbin Ehn]

Hi, this is the instructions for zcb.

Due to over lack of infrastructure having multiple extension dependent instruction does not fit well.
Some of these compressed instructions are also missing 1 to 1 mapping, e.g. now we have a compressed not, but the corresponding instruction in uncompressed is still xor.
I think we need to do some rework here.

I also I don't like the macro expansion as it hopeless in debugger and 'IDE's (vim+rtags for me).
(macro stuff was originally done when templates where blacklisted in hotspot)

And I don't want an options for this, as zcb is coming in hwprobe, if you have compressed on you get them if they are supported (may depend on e.g. zbb).

I have done some modification since it passed tier1, so I'm running stuff over the weekend.

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Commit messages:
 - zcb instruction set

Changes: https://git.openjdk.org/jdk/pull/17122/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17122&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320069
  Stats: 318 lines in 5 files changed: 277 ins; 0 del; 41 mod
  Patch: https://git.openjdk.org/jdk/pull/17122.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17122/head:pull/17122

PR: https://git.openjdk.org/jdk/pull/17122