Make ControlFlowGraph store a reference to Engines to remove clones

[JoshuaBatty]

Description

Using the same performance test as in #5976 and #5978, this change gives a further 21.33% performance improvement.

Before: Elapsed time: 14.653166459s
After: Elapsed time: 11.527667375s

[github-actions]

Benchmark for 073f71e

Click to view benchmark

Test	Base	PR	%
code_action	5.4±0.07ms	5.3±0.14ms	-1.85%
code_lens	292.7±8.18ns	290.3±4.98ns	-0.82%
compile	3.4±0.06s	3.0±0.04s	-11.76%
completion	4.9±0.33ms	4.6±0.09ms	-6.12%
did_change_with_caching	2.9±0.02s	2.9±0.03s	0.00%
document_symbol	1022.4±38.53µs	961.5±10.09µs	-5.96%
format	91.3±1.09ms	90.6±0.89ms	-0.77%
goto_definition	356.8±6.35µs	374.6±6.88µs	+4.99%
highlight	9.1±0.14ms	8.7±0.18ms	-4.40%
hover	476.6±6.04µs	493.2±5.52µs	+3.48%
idents_at_position	122.8±0.48µs	124.2±0.26µs	+1.14%
inlay_hints	662.7±15.69µs	686.4±55.34µs	+3.58%
on_enter	497.8±15.18ns	499.9±12.13ns	+0.42%
parent_decl_at_position	3.8±0.03ms	3.6±0.02ms	-5.26%
prepare_rename	357.6±6.14µs	374.3±4.37µs	+4.67%
rename	9.7±0.12ms	9.4±0.20ms	-3.09%
semantic_tokens	1029.2±19.35µs	1075.6±14.70µs	+4.51%
token_at_position	361.0±3.84µs	358.4±2.18µs	-0.72%
tokens_at_position	3.8±0.04ms	3.6±0.04ms	-5.26%
tokens_for_file	437.6±2.37µs	428.4±2.58µs	-2.10%
traverse	40.8±1.35ms	41.9±0.86ms	+2.70%

[github-actions]

Benchmark for 524d69f

Click to view benchmark

Test	Base	PR	%
code_action	5.4±0.08ms	5.2±0.08ms	-3.70%
code_lens	290.3±8.59ns	287.3±6.16ns	-1.03%
compile	3.4±0.05s	3.0±0.04s	-11.76%
completion	4.7±0.02ms	4.6±0.06ms	-2.13%
did_change_with_caching	2.9±0.03s	2.9±0.04s	0.00%
document_symbol	1004.1±36.56µs	995.9±18.93µs	-0.82%
format	90.4±1.24ms	89.7±1.14ms	-0.77%
goto_definition	360.6±8.03µs	365.7±8.74µs	+1.41%
highlight	9.1±0.02ms	8.7±0.12ms	-4.40%
hover	484.1±7.04µs	486.6±5.99µs	+0.52%
idents_at_position	122.9±0.58µs	123.7±0.83µs	+0.65%
inlay_hints	695.4±6.77µs	653.5±20.10µs	-6.03%
on_enter	483.8±11.42ns	488.5±14.12ns	+0.97%
parent_decl_at_position	3.8±0.02ms	3.6±0.03ms	-5.26%
prepare_rename	361.5±5.15µs	365.7±6.13µs	+1.16%
rename	9.7±0.13ms	9.3±0.10ms	-4.12%
semantic_tokens	1017.8±23.61µs	1064.5±16.47µs	+4.59%
token_at_position	379.1±2.01µs	354.0±3.16µs	-6.62%
tokens_at_position	3.8±0.09ms	3.6±0.09ms	-5.26%
tokens_for_file	439.2±3.74µs	420.7±2.24µs	-4.21%
traverse	40.3±1.34ms	41.0±0.93ms	+1.74%

[kayagokalp]

🚀