[jdk17u-dev] RFR: 8284578: Relax InterpreterCodelet stub alignment

[Dmitry Chuyko]

This change improves density of interpreter codelets. I have no intent to backport JDK-8281467 [1] (Allow larger OptoLoopAlignment and CodeEntryAlignment), entire JDK-8283298 [2] (productize CodeCacheSegmentSize) and its related change in stubRoutines.cpp JDK-8282355 [3].

However I suppose that Modification of MethodHandles::generate_adapters() from JDK-8283298 which makes blob size more accurate is related to this fix, so I included it here. JDK-8283298 modifications of TemplateInterpreter::initialize_stub() are overwritten by the changes from the original JDK-8284578 patch.

So this patch consists of
- Original JDK-8284578 altered to be applicable without JDK-8283298 and JDK-8264207 [4] (can be backported afterwards).
- MethodHandles::generate_adapters() and copyrights from JDK-8283298.

Testing: tier1, tier2 on x86 and aarch64 (release)

[0] https://bugs.openjdk.org/browse/JDK-8284578
[1] https://bugs.openjdk.org/browse/JDK-8281467
[2] https://bugs.openjdk.org/browse/JDK-8283298
[3] https://bugs.openjdk.org/browse/JDK-8282355
[4] https://bugs.openjdk.org/browse/JDK-8264207

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Commit messages:
 - Backport 2241a057050ed521cfbfbe8a758353e621dee15f

Changes: https://git.openjdk.org/jdk17u-dev/pull/753/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=753&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284578
  Stats: 54 lines in 6 files changed: 24 ins; 5 del; 25 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/753.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/753/head:pull/753

PR: https://git.openjdk.org/jdk17u-dev/pull/753