[ruby-core:116517] [Ruby master Bug#20229] Empty keyword splat in array not removed in ARGSPUSH case

Issue #20229 has been updated by jeremyevans0 (Jeremy Evans).


I found that this bug was actually reported earlier in #20180, which I already have submitted a pull request to fix.  I think we should use the approach in this pull request to fix this issue in master, as it is more efficient.  We could backport the fix in #20180 to Ruby 3.1-3.3.

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Bug #20229: Empty keyword splat in array not removed in ARGSPUSH case
https://bugs.ruby-lang.org/issues/20229#change-106536

* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
For the following code:

```ruby
a = []
kw = {}
[*a, **kw]
```

Ruby 2.0-3.3 return `[{}]`, when the desired result (since 2.7) is `[]`.

I discovered this while working on an optimization for the ARGSCAT case, where `[*a, 1, **kw]` allocates two arrays instead of a single array.  My optimization fixes that by adding a `pushtoarraykwsplat` instruction as a replacement for `newarraykwsplat`.  I've used `pushtoarraykwsplat` in the ARGSPUSH case to fix this bug.

My pull request for the bug fix and optimization: https://github.com/ruby/ruby/pull/9766



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