RFR: Split out ContinuationEntry and ContinuationWrapper classes [v4]

[Coleen Phillimore]

On Thu, 14 Apr 2022 19:55:08 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Moved ContinuationEntry and ContinuationWrapper to their own files.
>> There's a bit of inconsistency because 3 ContinuationEntry functions are in ContinuationHelper_cpu.inline.hpp - maybe we should have continuationEntry_cpu.inline.hpp files for just the three.
>> I'd like to change the name ContinuationEntry to ContinuationAnchor or ContinuationFrameAnchor but want to study how that would look a bit more first.
>> Tested with other platforms and testing with loom-tier1 as sanity.
>
> Coleen Phillimore has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - git add missing files
>  - Add continuationEntry.inline.hpp

Most of the tests ran anyway.

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PR: https://git.openjdk.java.net/loom/pull/145