Implement Symbol.for and Symbol.keyFor

[HalidOdat]

It changes the following:

• Implement Symbol.for( key )
• Implement Symbol.keyFor( sym )

[github-actions]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,897	78,897	0
Passed	27,984	28,014	+30
Ignored	15,616	15,616	0
Failed	35,297	35,267	-30
Panics	0	0	0
Conformance	35.47%	35.51%	+0.04%

Fixed tests:

test/built-ins/Symbol/keyFor/name.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/name.js (previously Failed)
test/built-ins/Symbol/keyFor/arg-non-symbol.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/arg-non-symbol.js (previously Failed)
test/built-ins/Symbol/keyFor/prop-desc.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/prop-desc.js (previously Failed)
test/built-ins/Symbol/keyFor/cross-realm.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/cross-realm.js (previously Failed)
test/built-ins/Symbol/keyFor/arg-symbol-registry-miss.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/arg-symbol-registry-miss.js (previously Failed)
test/built-ins/Symbol/keyFor/length.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/length.js (previously Failed)
test/built-ins/Symbol/keyFor/arg-symbol-registry-hit.js [strict mode] (previously Failed)
test/built-ins/Symbol/keyFor/arg-symbol-registry-hit.js (previously Failed)
test/built-ins/Symbol/for/name.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/name.js (previously Failed)
test/built-ins/Symbol/for/create-value.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/create-value.js (previously Failed)
test/built-ins/Symbol/for/prop-desc.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/prop-desc.js (previously Failed)
test/built-ins/Symbol/for/to-string-err.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/to-string-err.js (previously Failed)
test/built-ins/Symbol/for/retrieve-value.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/retrieve-value.js (previously Failed)
test/built-ins/Symbol/for/cross-realm.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/cross-realm.js (previously Failed)
test/built-ins/Symbol/for/description.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/description.js (previously Failed)
test/built-ins/Symbol/for/length.js [strict mode] (previously Failed)
test/built-ins/Symbol/for/length.js (previously Failed)

[github-actions]

Benchmark for 2b2d916

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	233.3±0.42ns	239.5±0.85ns	-2.59%
Arithmetic operations (Full)	236.0±0.44µs	235.6±1.53µs	+0.17%
Array access (Execution)	5.4±0.02µs	5.4±0.02µs	0.00%
Array access (Full)	257.9±0.41µs	256.9±0.50µs	+0.39%
Array creation (Execution)	2.4±0.00ms	2.3±0.00ms	+4.35%
Array creation (Full)	2.5±0.02ms	2.6±0.00ms	-3.85%
Array pop (Execution)	788.1±2.11µs	771.8±2.25µs	+2.11%
Array pop (Full)	1170.9±2.85µs	1181.0±2.56µs	-0.86%
Boolean Object Access (Execution)	4.6±0.01µs	4.6±0.04µs	0.00%
Boolean Object Access (Full)	253.0±1.02µs	250.1±0.70µs	+1.16%
Clean js (Execution)	531.6±2.34µs	532.3±5.54µs	-0.13%
Clean js (Full)	810.7±9.46µs	812.6±2.69µs	-0.23%
Clean js (Parser)	34.9±0.04µs	34.9±0.06µs	0.00%
Create Realm	355.9±0.55ns	351.5±0.92ns	+1.25%
Dynamic Object Property Access (Execution)	4.3±0.02µs	4.4±0.01µs	-2.27%
Dynamic Object Property Access (Full)	256.6±1.98µs	252.6±0.46µs	+1.58%
Expression (Parser)	5.8±0.01µs	5.8±0.01µs	0.00%
Fibonacci (Execution)	651.0±1.43µs	643.2±4.70µs	+1.21%
Fibonacci (Full)	932.3±3.32µs	921.5±0.83µs	+1.17%
For loop (Execution)	17.1±0.06µs	17.2±0.10µs	-0.58%
For loop (Full)	265.4±0.53µs	262.8±0.46µs	+0.99%
For loop (Parser)	16.6±0.04µs	16.7±0.04µs	-0.60%
Goal Symbols (Parser)	12.0±0.02µs	12.0±0.03µs	0.00%
Hello World (Parser)	3.2±0.00µs	3.2±0.03µs	0.00%
Long file (Parser)	724.7±7.78ns	729.2±0.98ns	-0.62%
Mini js (Execution)	482.0±2.25µs	482.8±5.06µs	-0.17%
Mini js (Full)	751.6±2.75µs	758.0±2.43µs	-0.84%
Mini js (Parser)	30.2±0.04µs	30.4±0.03µs	-0.66%
Number Object Access (Execution)	3.5±0.01µs	3.6±0.01µs	-2.78%
Number Object Access (Full)	249.5±1.09µs	246.5±2.97µs	+1.22%
Object Creation (Execution)	3.9±0.02µs	3.8±0.01µs	+2.63%
Object Creation (Full)	252.4±0.34µs	248.3±0.66µs	+1.65%
RegExp (Execution)	11.1±0.07µs	10.9±0.03µs	+1.83%
RegExp (Full)	259.6±0.40µs	255.3±0.48µs	+1.68%
RegExp Literal (Execution)	11.0±0.06µs	10.8±0.04µs	+1.85%
RegExp Literal (Full)	265.4±0.42µs	262.6±0.71µs	+1.07%
RegExp Literal Creation (Execution)	8.5±0.02µs	8.2±0.03µs	+3.66%
RegExp Literal Creation (Full)	257.6±0.62µs	252.6±0.55µs	+1.98%
Static Object Property Access (Execution)	4.0±0.01µs	4.1±0.09µs	-2.44%
Static Object Property Access (Full)	254.8±0.44µs	249.9±0.37µs	+1.96%
String Object Access (Execution)	5.8±0.02µs	6.0±0.03µs	-3.33%
String Object Access (Full)	255.6±0.43µs	253.0±0.53µs	+1.03%
String comparison (Execution)	5.5±0.02µs	5.5±0.03µs	0.00%
String comparison (Full)	254.1±0.50µs	252.8±0.35µs	+0.51%
String concatenation (Execution)	4.2±0.01µs	4.3±0.02µs	-2.33%
String concatenation (Full)	249.2±0.70µs	246.2±0.47µs	+1.22%
String copy (Execution)	3.4±0.01µs	3.4±0.01µs	0.00%
String copy (Full)	245.6±0.29µs	241.3±0.46µs	+1.78%
Symbols (Execution)	2.9±0.01µs	3.0±0.01µs	-3.33%
Symbols (Full)	231.8±2.35µs	230.2±1.35µs	+0.70%