RFR: 8266810: Move trivial Matcher code to cpu-specific header files [v2]

[Claes Redestad]

> This patch moves a number of constants and trivial methods to newly introduced matcher_<cpu>.hpp files.
> 
> This enables constant folding and dead code elimination on one hand, and improved code navigation in IDEs on the other. 
> 
> The effect of this refactoring is modest: on Linux-x64 Hotspot (libjvm.so) shrinks by ~10Kb and C2 initialization cost drops from 8.5M to 8.3M.
> 
> Testing: tier1-3, GHA builds of all architectures on linux

Claes Redestad has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - merge and resolve conflict in arm.ad
 - Move more predicates from .ad files
 - Move a few more predicates to matcher_cpu files
 - Add the new matcher per-cpu files
 - Add matcher_cpu files and move const bools there
 - Define constants to allow Matcher::supports_scalable_vector() calls to be DCEd on non-aarch64 platforms

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Changes: https://git.openjdk.java.net/jdk/pull/3947/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3947&range=01
  Stats: 1459 lines in 15 files changed: 775 ins; 682 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3947.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3947/head:pull/3947

PR: https://git.openjdk.java.net/jdk/pull/3947