RFR: 8263769: simplify PhaseMacroExpand::extract_call_projections() [v3]

[Xin Liu]

On Wed, 24 Mar 2021 07:13:18 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename PhaseMacroExpand::_call_projects to PhaseMacroExpand::_callprojs.
>
> Nice cleanup! I've added some minor style comments.

Thanks for reviewing and sponsoring this patch.

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PR: https://git.openjdk.java.net/jdk/pull/3105