RFR: 8375271: [IR Framework] Rename IREncoding to ApplicableIRRules and driver/flag/test VM to Driver/Flag/Test VM

[Christian Hagedorn]

This patch is part of a series of patches split of from a prototype implementation for replacing the hotspot-pid file based transfer of IR dumps between the Test VM and the Driver VM with a socket based transfer (see [JDK-8375271](https://bugs.openjdk.org/browse/JDK-8375271) for more information). This should ease reviews.

This patch is about naming updates:

`IREncoding` is quite generic and does not really tell what it is about by looking at its name. I suggest to rename it to `ApplicableIRRules` to better reflect what it is about. I also capitalized the first letter of "driver/flag/test VM" to better indicate that these are proper names.

Thanks,
Christian

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Commit messages:
 - 8375271: [IR Framework] Rename IREncoding to ApplicableIRRules and driver/flag/test VM to Driver/Flag/Test VM

Changes: https://git.openjdk.org/jdk/pull/29229/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29229&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375271
  Stats: 496 lines in 28 files changed: 162 ins; 159 del; 175 mod
  Patch: https://git.openjdk.org/jdk/pull/29229.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29229/head:pull/29229

PR: https://git.openjdk.org/jdk/pull/29229