[lworld] RFR: 8361250: [lworld] use more IRNode regexes in valhalla IR tests

[Marc Chevalier]

InlineTypeIRNode is Valhalla-specific and somewhat... antique. I've run into an issue where the old-timey regex for allocation didn't do the job. So, rather than reproducing the fix of [JDK-8314999](https://bugs.openjdk.org/browse/JDK-8314999) again, let's simply use `IRNode`'s regex for Valhalla as well.

The general idea: let's not define node regex specifically for Valhalla, but only for values. I've also introduced regexes for combinations we do all the time: for instance rather than having `ALLOC_OF, ANY_KLASS`, I made a `ALLOC_OF_ANY_KLASS`.

So what now:
- `InlineTypeRegexes` => only value regexes.
- `IRNode` => adapted to allow to define specialisation for `ALLOC_OF`, `ALLOC_ARRAY_OF`, `LOAD_OF_CLASS`, `STORE_OF_CLASS`, `STATIC_CALL_OF_METHOD` for specific classes/functions.
- `InlineTypeIRNode` => define specialisations using the regexes defined in `InlineTypeRegexes`, nothing more!
- `compiler/valhalla/inlinetypes/Test*` => use `IRNode` and `InlineTypeIRNode`.

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Commit messages:
 - Fix visibility
 - Forgot a space
 - Refactor inlinetypes/InlineTypeIRNode

Changes: https://git.openjdk.org/valhalla/pull/1503/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1503&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361250
  Stats: 754 lines in 14 files changed: 152 ins; 148 del; 454 mod
  Patch: https://git.openjdk.org/valhalla/pull/1503.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1503/head:pull/1503

PR: https://git.openjdk.org/valhalla/pull/1503