[jdk17u-dev] RFR: 8284578: Relax InterpreterCodelet stub alignment [v3]

[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

Dmitry Chuyko has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  Backport 2241a057050ed521cfbfbe8a758353e621dee15f

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Changes: https://git.openjdk.org/jdk17u-dev/pull/753/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=753&range=02
  Stats: 46 lines in 5 files changed: 16 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