RFR: 8251462: Remove legacy compilation policy

[Igor Veresov]

This change removes the legacy compilation policy and an emulation mode to the tiered policy to simulate the old behavior with ```-XX:-TieredCompilation```. The change removed a bunch of interpreter code, devirtualizes the compilation policy API, adds a consistent way to query compiler configuration with the new ```CompilerConfig``` API.

I've tested this with hs-tier{1,2,3,4,5}. And also made sure it builds and works with C1/C2-Graal/AOT being enabled/disabled.

Since there are platform-specific changes I would greatly appreciate some help from the maintainers of the specific ports to verify the build and run basic smoke tests. I've already tested x64 and aarch64. Thanks!

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Commit messages:
 - Fix copyright years
 - Remove legacy compilation policy.

Changes: https://git.openjdk.java.net/jdk/pull/1985/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1985&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251462
  Stats: 5285 lines in 95 files changed: 1481 ins; 2979 del; 825 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1985.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1985/head:pull/1985

PR: https://git.openjdk.java.net/jdk/pull/1985