[ruby-core:112671] [Ruby master Feature#19474] Reduce the number of NEWOBJ macros

Issue #19474 has been reported by eightbitraptor (Matthew Valentine-House).

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Feature #19474: Reduce the number of NEWOBJ macros
https://bugs.ruby-lang.org/issues/19474

* Author: eightbitraptor (Matthew Valentine-House)
* Status: Open
* Priority: Normal
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[Github PR](https://github.com/ruby/ruby/pull/7393)

Since the introduction of variable width allocation with `RVARGC` there are a lot of different `*NEWOBJ*` macros. Currently there are:

* `RB_RVARGC_NEWOBJ_OF`
* `RB_RVARGC_EC_NEWOBJ_OF`
* `RB_NEWOBJ_OF`, an alias of `RB_RVARGC_NEWOBJ_OF`
* `RB_EC_NEWOBJ_OF`, an alias of `RB_RVARGC_EC_NEWOBJ_OF`
* `NEWOBJ_OF`, an alias of `RB_RVARGC_NEWOBJ_OF`
* `RVARGC_NEWOBJ_OF`, an alias of `RB_RVARGC_NEWOBJ_OF`

This PR merges `RB_RVARGC_NEWOBJ_OF` and `RB_RVARGC_EC_NEWOBJ_OF` into a single macro that takes the `ec` as an argument (which can be `NULL`). The resulting macro has been renamed to `RVARGC_NEWOBJ_OF` as the existing `RVARGC_NEWOBJ_OF` was an alias for `RB_RVARGC_NEWOBJ_OF`.

`RB_NEWOBJ_OF`, `RB_EC_NEWOBJ_OF` have been removed, as these were just aliases for `RB_RVARGC_NEWOBJ_OF`.

`RB_NEWOBJ_OF` and `NEWOBJ_OF` have been retained as these are part of the public API exposed in `include/ruby/internal/newobj.h` so they are available to extension authors.



-- 
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