RFR: 8329597: C2: Intrinsify Reference.clear [v4]

[Aleksey Shipilev]

> [JDK-8240696](https://bugs.openjdk.org/browse/JDK-8240696) added the native method for `Reference.clear`. The original patch skipped intrinsification of this method, because we thought `Reference.clear` is not on a performance sensitive path. However, it shows up prominently on simple benchmarks that touch e.g. `ThreadLocal` cleanups. See the bug for an example profile with `RRWL` benchmarks.
> 
> We need to know the actual oop strongness/weakness before we call into C2 Access API, this work models this after existing code for `refersTo0` intrinsics. C2 Access also need a support for `AS_NO_KEEPALIVE` for stores. 
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `all`
>  - [x] Linux AArch64 server fastdebug, `all`

Aleksey Shipilev 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 eight additional commits since the last revision:

 - Attempt at implementing ZGC AArch64 parts
 - Merge branch 'master' into JDK-8329597-intrinsify-reference-clear
 - Amend the test case for guaranteing it works under different compilation regimes
 - More precise barriers
 - Tests work
 - More touchups
 - Fixing the conditions, fixing the tests
 - Crude prototype, still failing the tests

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20139/files
  - new: https://git.openjdk.org/jdk/pull/20139/files/437f2329..cba0a8e9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=02-03

  Stats: 258786 lines in 3084 files changed: 211178 ins; 30411 del; 17197 mod
  Patch: https://git.openjdk.org/jdk/pull/20139.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20139/head:pull/20139

PR: https://git.openjdk.org/jdk/pull/20139