Remove arguments_binding field from CodeBlock

[HalidOdat]

This PR reorders a spec step to ensure that the "arguments" binding is always in the 0 position. This allows us to remove the arguments_binding field completely since we know in which environment it is (last pushed) and what index it has (0).

Removes 24 bytes from CodeBlock (from 184 bytes to 160 bytes)

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	93,990	93,990	0
Passed	74,620	74,620	0
Ignored	17,622	17,622	0
Failed	1,748	1,748	0
Panics	0	0	0
Conformance	79.39%	79.39%	0.00%

[codecov]

Codecov Report

Merging #2969 (cfa3695) into main (67c5652) will increase coverage by 0.01%.
The diff coverage is 97.82%.

❗ Current head cfa3695 differs from pull request most recent head 6eea363. Consider uploading reports for the commit 6eea363 to get more accurate results

@@            Coverage Diff             @@
##             main    #2969      +/-   ##
==========================================
+ Coverage   50.01%   50.03%   +0.01%     
==========================================
  Files         446      446              
  Lines       45906    45925      +19     
==========================================
+ Hits        22961    22979      +18     
- Misses      22945    22946       +1     

Impacted Files	Coverage Δ
boa_engine/src/bytecompiler/mod.rs	65.93% <ø> (-0.05%)	⬇️
boa_engine/src/vm/code_block.rs	55.83% <95.65%> (+0.75%)	⬆️
boa_engine/src/builtins/function/arguments.rs	96.72% <100.00%> (+0.05%)	⬆️
boa_engine/src/bytecompiler/declarations.rs	55.88% <100.00%> (+0.43%)	⬆️

[HalidOdat]

Main:

Richards: 20.5
DeltaBlue: 24.7
RayTrace: 82.0
----
Score (version 7): 34.6

PR:

Richards: 20.7
DeltaBlue: 25.0
RayTrace: 82.8
----
Score (version 7): 35.0
undefined

There is an improvement in performance :)

[raskad]

Nice work!

[jedel1043]

Looks good!

[Razican]

Main:

Richards: 20.5
DeltaBlue: 24.7
RayTrace: 82.0
----
Score (version 7): 34.6

PR:

Richards: 20.7
DeltaBlue: 25.0
RayTrace: 82.8
----
Score (version 7): 35.0
undefined

There is an improvement in performance :)

What benchmarking technique are you using here? Could we document it so that we can at some point run it in the CI or manually?

[HalidOdat]

What benchmarking technique are you using here?

I used the benchmark in this comment #1924 (comment) it is a subset of the quickjs benchmarks (for the full benchmarks see #1924 (comment)), I didn't use the full one because one has a very long execution time ~15min

To run the benchmarks with the boa cli with the file. (cargo run --bin boa --release -- bench.js).

Could we document it so that we can at some point run it in the CI

I don't know if the results would be that useful, at least while running with the github job runners...