Respect Rust 1.53

[RageKnify]

A few refactors and style fixes to respect new clippy and rustfmt.

[github-actions]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,897	78,897	0
Passed	26,940	26,941	+1
Ignored	15,628	15,628	0
Failed	36,329	36,328	-1
Panics	1	0	-1
Conformance	34.15%	34.15%	+0.00%

Fixed tests:

test/built-ins/Map/prototype/keys/returns-iterator.js (previously Panic)

[github-actions]

Benchmark for 233a3b4

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	370.1±3.65ns	360.1±8.79ns	+2.78%
Arithmetic operations (Full)	280.3±2.11µs	269.4±5.49µs	+4.05%
Array access (Execution)	6.5±0.14µs	6.5±0.07µs	0.00%
Array access (Full)	297.3±6.00µs	296.0±7.24µs	+0.44%
Array creation (Execution)	2.8±0.06ms	3.0±0.06ms	-6.67%
Array creation (Full)	3.0±0.06ms	3.3±0.08ms	-9.09%
Array pop (Execution)	933.5±11.03µs	938.7±20.75µs	-0.55%
Array pop (Full)	1398.9±19.98µs	1404.4±34.17µs	-0.39%
Boolean Object Access (Execution)	5.4±0.07µs	5.3±0.10µs	+1.89%
Boolean Object Access (Full)	284.7±5.66µs	291.7±6.43µs	-2.40%
Clean js (Execution)	609.0±14.51µs	635.8±23.97µs	-4.22%
Clean js (Full)	942.7±22.83µs	934.2±17.09µs	+0.91%
Clean js (Parser)	39.6±0.90µs	38.3±1.19µs	+3.39%
Create Realm	455.0±14.10ns	414.6±8.98ns	+9.74%
Dynamic Object Property Access (Execution)	5.2±0.10µs	5.2±0.13µs	0.00%
Dynamic Object Property Access (Full)	290.5±6.43µs	291.4±7.20µs	-0.31%
Expression (Parser)	7.1±0.11µs	7.0±0.09µs	+1.43%
Fibonacci (Execution)	744.7±23.05µs	749.7±17.25µs	-0.67%
Fibonacci (Full)	1057.9±24.10µs	1063.3±20.52µs	-0.51%
For loop (Execution)	21.9±0.57µs	21.6±0.38µs	+1.39%
For loop (Full)	301.2±5.50µs	303.9±6.03µs	-0.89%
For loop (Parser)	19.5±0.42µs	19.4±0.28µs	+0.52%
Goal Symbols (Parser)	13.7±0.23µs	13.3±0.25µs	+3.01%
Hello World (Parser)	3.9±0.12µs	4.0±0.11µs	-2.50%
Long file (Parser)	782.9±13.01ns	810.3±44.19ns	-3.38%
Mini js (Execution)	555.4±12.92µs	570.3±6.18µs	-2.61%
Mini js (Full)	865.9±13.06µs	887.2±12.64µs	-2.40%
Mini js (Parser)	34.9±0.56µs	33.9±0.78µs	+2.95%
Number Object Access (Execution)	4.3±0.07µs	4.1±0.09µs	+4.88%
Number Object Access (Full)	291.9±4.55µs	288.1±5.80µs	+1.32%
Object Creation (Execution)	4.6±0.01µs	4.3±0.10µs	+6.98%
Object Creation (Full)	288.1±5.88µs	291.8±5.76µs	-1.27%
RegExp (Execution)	11.7±0.27µs	11.0±0.26µs	+6.36%
RegExp (Full)	298.3±5.52µs	308.3±4.76µs	-3.24%
RegExp Literal (Execution)	11.8±0.09µs	11.0±0.24µs	+7.27%
RegExp Literal (Full)	292.8±7.59µs	305.9±6.07µs	-4.28%
RegExp Literal Creation (Execution)	10.1±0.21µs	9.5±0.20µs	+6.32%
RegExp Literal Creation (Full)	286.0±6.00µs	286.4±8.38µs	-0.14%
Static Object Property Access (Execution)	4.8±0.03µs	4.6±0.11µs	+4.35%
Static Object Property Access (Full)	300.1±14.09µs	296.3±4.34µs	+1.28%
String Object Access (Execution)	7.5±0.13µs	7.2±0.17µs	+4.17%
String Object Access (Full)	292.4±7.19µs	294.6±6.54µs	-0.75%
String comparison (Execution)	6.6±0.35µs	6.4±0.14µs	+3.12%
String comparison (Full)	286.8±6.19µs	287.0±7.36µs	-0.07%
String concatenation (Execution)	5.2±0.10µs	5.2±0.11µs	0.00%
String concatenation (Full)	281.1±8.36µs	281.8±6.24µs	-0.25%
String copy (Execution)	4.1±0.06µs	3.9±0.07µs	+5.13%
String copy (Full)	277.1±7.28µs	275.0±5.91µs	+0.76%
Symbols (Execution)	3.4±0.07µs	3.5±0.07µs	-2.86%
Symbols (Full)	272.4±5.29µs	267.0±7.91µs	+2.02%