RFR: 8294609: C2: Improve inlining of methods with unloaded signature classes [v3]

[Vladimir Ivanov]

On Fri, 30 Sep 2022 20:09:08 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Can you elaborate, please? Neither method resolution nor method selection steps trigger loading of signature classes.
>
> Maybe "loads signature classes" is the wrong choice of words.  I mean what SystemDictionary::check_signature_loaders() does.  Using the CI interface is guaranteed to go through SystemDictionary::check_signature_loaders(), right?

CI doesn't use `SystemDictionary::check_signature_loaders()`. `ciSignature` constructor eventually calls into `SystemDictionary::find_constrained_instance_or_array_klass()` which also tries `LoaderConstraintTable::find_constrained_klass()` if local search fails.

I tried to stress that by stating that "signature classes aren't required to be local" and "it makes signature classes visible through loader constraints".

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PR: https://git.openjdk.org/jdk/pull/10496