RFR: 8324750: C2: rename Matcher methods using "superword" -> "autovectorization" [v2]

[Emanuel Peter]

> Subtask of https://github.com/openjdk/jdk/pull/16620
> 
> Matcher::superword_max_vector_size -> Matcher::max_vector_size_autovectorization
> 
> Matcher::match_rule_supported_superword -> match_rule_supported_autovectorization
> 
> This is to make the naming more general, since these methods can be used by any autovectorizer in the future.

Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:

  underscore for Christian

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17583/files
  - new: https://git.openjdk.org/jdk/pull/17583/files/e85e7e1b..f380c671

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17583&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17583&range=00-01

  Stats: 28 lines in 12 files changed: 0 ins; 0 del; 28 mod
  Patch: https://git.openjdk.org/jdk/pull/17583.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17583/head:pull/17583

PR: https://git.openjdk.org/jdk/pull/17583